Feat: bot message routing (#2100)

* refactor: pipeline routing rules - add routed_by_rule bypass and diagnostic logging

- Add routing rules editor (RoutingRulesEditor component)
- Add routed_by_rule bypass logic in response rules
- Add diagnostic logging for pipeline routing
- Database migration for bot pipeline routing rules
- Extract RoutingRulesEditor component from BotForm
- Revert log levels to debug

* feat: add message_has_element routing rule type

Support routing by message element type (Image, Voice, File, Forward,
Face, At, AtAll, Quote) with eq/neq operators.

* test: add unit tests for pipeline routing rules

20 tests covering _match_operator (eq/neq/contains/not_contains/
starts_with/regex/invalid) and resolve_pipeline_uuid (launcher_type/
launcher_id/message_content/message_has_element/first-match-wins/
skip-invalid/default-operator).

* fix(web): add missing 'message_has_element' to routing rule type validation

The Zod schema and TypeScript type for PipelineRoutingRule.type were
missing the 'message_has_element' variant, causing silent form validation
failure when saving routing rules with this type.

* feat: add pipeline discard functionality and localization support

* feat(web): improve drag-and-drop with DragOverlay, add discard monitoring and pipeline icons

- Add DragOverlay for smooth cursor-following drag in routing rules editor
- Remove transition to eliminate redundant swap animation on drop
- Record discarded messages in monitoring system via _record_discarded_message
- Display pipeline name (Workflow icon) and runner name (Play icon) on session monitor messages
- Show discard badge on discarded messages in session monitor
- Add i18n translations for discarded/userMessage/botMessage

* fix: ensure discarded messages appear in session monitor and improve icons

- Create/update monitoring session for discarded messages so they show in
  the bot session monitor (was only inserting message rows, not sessions)
- Use human-readable 'Discarded' as pipeline_name instead of '__discard__'
- Change runner icon from Play to Bot for better AI Agent semantics

* fix: merge discarded messages into same session and remove session-level pipeline name

- Use LauncherTypes enum for session_id in discarded messages to match
  the format used by monitoring_helper (fixes duplicate sessions)
- Don't overwrite session pipeline info on discard — a session can have
  messages from multiple pipelines
- Remove pipeline_name from session list and chat header since it's
  now shown per-message and a session is no longer single-pipeline

* fix(web): only show save button on config tab in bot detail page

* fix(web): scroll to bottom after messages render in session monitor

---------

Co-authored-by: RockChinQ <rockchinq@gmail.com>

tests/unit_tests/platform/test_routing_rules.py

@@ -0,0 +1,280 @@
+"""
+RuntimeBot.resolve_pipeline_uuid and _match_operator unit tests
+"""
+
+from unittest.mock import Mock
+
+
+class TestMatchOperator:
+    """Test the _match_operator static method."""
+
+    @staticmethod
+    def _get_class():
+        from langbot.pkg.platform.botmgr import RuntimeBot
+
+        return RuntimeBot
+
+    def test_eq(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello', 'eq', 'hello') is True
+        assert cls._match_operator('hello', 'eq', 'world') is False
+
+    def test_neq(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello', 'neq', 'world') is True
+        assert cls._match_operator('hello', 'neq', 'hello') is False
+
+    def test_contains(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello world', 'contains', 'world') is True
+        assert cls._match_operator('hello world', 'contains', 'xyz') is False
+
+    def test_not_contains(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello world', 'not_contains', 'xyz') is True
+        assert cls._match_operator('hello world', 'not_contains', 'world') is False
+
+    def test_starts_with(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello world', 'starts_with', 'hello') is True
+        assert cls._match_operator('hello world', 'starts_with', 'world') is False
+
+    def test_regex(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello123', 'regex', r'\d+') is True
+        assert cls._match_operator('hello', 'regex', r'\d+') is False
+
+    def test_regex_invalid_pattern(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello', 'regex', r'[invalid') is False
+
+    def test_unknown_operator(self):
+        cls = self._get_class()
+        assert cls._match_operator('hello', 'unknown_op', 'hello') is False
+
+
+class TestResolvePipelineUuid:
+    """Test the resolve_pipeline_uuid method."""
+
+    @staticmethod
+    def _make_bot(default_pipeline: str, rules: list):
+        from langbot.pkg.platform.botmgr import RuntimeBot
+
+        bot_entity = Mock()
+        bot_entity.use_pipeline_uuid = default_pipeline
+        bot_entity.pipeline_routing_rules = rules
+
+        bot = object.__new__(RuntimeBot)
+        bot.bot_entity = bot_entity
+        return bot
+
+    def test_no_rules_returns_default(self):
+        bot = self._make_bot('default-uuid', [])
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_none_rules_returns_default(self):
+        bot = self._make_bot('default-uuid', None)
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_launcher_type_match(self):
+        rules = [
+            {
+                'type': 'launcher_type',
+                'operator': 'eq',
+                'value': 'group',
+                'pipeline_uuid': 'group-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('group', '123', 'hi')
+        assert uuid == 'group-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_launcher_id_match(self):
+        rules = [
+            {
+                'type': 'launcher_id',
+                'operator': 'eq',
+                'value': '12345',
+                'pipeline_uuid': 'vip-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '12345', 'hi')
+        assert uuid == 'vip-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '99999', 'hi')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_message_content_contains(self):
+        rules = [
+            {
+                'type': 'message_content',
+                'operator': 'contains',
+                'value': '紧急',
+                'pipeline_uuid': 'urgent-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', '这是紧急消息')
+        assert uuid == 'urgent-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', '普通消息')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_message_content_regex(self):
+        rules = [
+            {
+                'type': 'message_content',
+                'operator': 'regex',
+                'value': r'^/admin\b',
+                'pipeline_uuid': 'admin-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', '/admin help')
+        assert uuid == 'admin-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hello /admin')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_message_has_element_eq(self):
+        rules = [
+            {
+                'type': 'message_has_element',
+                'operator': 'eq',
+                'value': 'Image',
+                'pipeline_uuid': 'image-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi', ['Plain', 'Image'])
+        assert uuid == 'image-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi', ['Plain'])
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_message_has_element_neq(self):
+        rules = [
+            {
+                'type': 'message_has_element',
+                'operator': 'neq',
+                'value': 'Image',
+                'pipeline_uuid': 'text-only-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi', ['Plain'])
+        assert uuid == 'text-only-pipeline'
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi', ['Plain', 'Image'])
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_message_has_element_no_types_provided(self):
+        """When element types are not provided, should not match."""
+        rules = [
+            {
+                'type': 'message_has_element',
+                'operator': 'eq',
+                'value': 'Image',
+                'pipeline_uuid': 'image-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'default-uuid'
+        assert routed is False
+
+    def test_first_match_wins(self):
+        rules = [
+            {
+                'type': 'launcher_type',
+                'operator': 'eq',
+                'value': 'group',
+                'pipeline_uuid': 'first-pipeline',
+            },
+            {
+                'type': 'launcher_type',
+                'operator': 'eq',
+                'value': 'group',
+                'pipeline_uuid': 'second-pipeline',
+            },
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('group', '123', 'hi')
+        assert uuid == 'first-pipeline'
+        assert routed is True
+
+    def test_skip_invalid_rules(self):
+        rules = [
+            {'type': '', 'operator': 'eq', 'value': 'x', 'pipeline_uuid': 'p1'},
+            {'type': 'launcher_type', 'operator': 'eq', 'value': 'person', 'pipeline_uuid': ''},
+            {'type': 'launcher_type', 'operator': 'eq', 'value': 'person', 'pipeline_uuid': 'valid'},
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'valid'
+        assert routed is True
+
+    def test_default_operator_is_eq(self):
+        rules = [
+            {
+                'type': 'launcher_type',
+                'value': 'person',
+                'pipeline_uuid': 'person-pipeline',
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'hi')
+        assert uuid == 'person-pipeline'
+        assert routed is True
+
+    def test_discard_pipeline(self):
+        """When pipeline_uuid is __discard__, the message should be discarded."""
+        from langbot.pkg.platform.botmgr import RuntimeBot
+
+        rules = [
+            {
+                'type': 'message_content',
+                'operator': 'contains',
+                'value': 'spam',
+                'pipeline_uuid': RuntimeBot.PIPELINE_DISCARD,
+            }
+        ]
+        bot = self._make_bot('default-uuid', rules)
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'this is spam')
+        assert uuid == RuntimeBot.PIPELINE_DISCARD
+        assert routed is True
+
+        uuid, routed = bot.resolve_pipeline_uuid('person', '123', 'normal message')
+        assert uuid == 'default-uuid'
+        assert routed is False