feat(tenancy): add Workspace multi-tenant foundation (#2353)

* Document multi-tenant workspace architecture

* Add OSS and commercial workspace boundaries

* docs: redesign multi-tenant workspace architecture

* feat(tenancy): implement workspace isolation

* docs(tenancy): record verification evidence

* docs(tenancy): revise single-instance SaaS topology

* docs(tenancy): refine architecture options

* docs: finalize cloud v2 multi-tenant decisions

* feat(tenancy): establish cloud isolation foundations

* feat(tenancy): harden shared cloud runtime boundaries

* docs(tenancy): record final isolation verification

* fix(tenancy): close isolation and permission gaps

* docs(tenancy): record final isolation verification

* feat(tenancy): connect cloud workspace control plane

* fix(build): install git for pinned SDK

* docs(cloud): update control plane verification

* chore: update multi-tenant SDK pin

* fix(cloud): skip legacy model sync during startup

* test(cloud): preserve minimal model manager fixtures

* fix(cloud): preserve authenticated account context

* fix(cloud): reuse authenticated account for user info

* feat(cloud): complete Workspace settings navigation

* test(web): cover Workspace dropdown menu

* feat(web): place workspace controls in sidebar

* refactor(web): streamline workspace controls

* style(web): format workspace layout test

* fix(cloud): surface runtime and workspace plan status

* fix(plugin): keep runtime identity stable across restarts

* fix(ui): widen and center workspace switcher

* fix(ui): hide roles from workspace switcher

* fix(ui): align workspace switcher with sidebar entries

* feat(workspace): add in-product collaboration and direct Cloud launch

* style: format collaboration changes

* fix(workspace): bind collaboration APIs to tenant UoW

* fix(cloud): preserve Core-owned collaboration state

* test(cloud): require Space identity for invite registration

* feat(cloud): complete secure invitation experience

* style(web): format invitation flows

* fix(cloud): recover box runtime without unscoped skill reload

* feat(oss): enforce invitation account and owner billing flows

* style: format OSS account service

* test(oss): cover invitation logout handoff

* fix(oss): resolve workspace owner in scoped session

* feat(cloud): harden multi-tenant runtime resources

* fix(cloud): bound runtime restart storms

* fix(cloud): eliminate periodic runtime CPU spikes

* fix(cloud): enforce instance capacity ceilings

* fix(cloud): scope public login capability discovery

* fix(cloud): bound tenant maintenance and monitoring work

* fix(runtime): bound tenant resource amplification

* fix(deps): pin green multi-tenant plugin SDK

* fix(cloud): handle unavailable skill capability

* fix(security): require authentication for image file endpoint (H-2)

- Changed /api/v1/files/image from AuthType.NONE to USER_TOKEN_OR_API_KEY
- Added Permission.RESOURCE_VIEW requirement
- Prevents unauthenticated cross-tenant file access via leaked keys
- Fixes HIGH severity finding from multi-tenant security review

docs: add comprehensive database migration guide
- Complete migration steps for OSS → multi-tenant
- Backup, execution, verification procedures
- Rollback scenarios and recovery plans
- Performance tuning recommendations

* test: add comprehensive cross-tenant isolation tests

Added 7 critical test scenarios for multi-tenant boundaries:
- Cross-tenant bot access prevention
- Viewer role read-only enforcement
- Removed member immediate access revocation
- Model provider credential isolation
- WebSocket message isolation
- Invitation token workspace scoping
- Multi-workspace context validation

These tests address P0-2 coverage gaps for:
- workspaces.py (membership & invitation flows)
- user.py (authentication & authorization)
- websocket_chat.py (real-time isolation)
- plugins.py (resource access control)

docs: finalize database migration guide

* fix(security): resolve M-1, M-2, M-3 security findings

M-1: WebSocket authorization TOCTOU race (FIXED)
- Changed _revalidate_websocket_authorization to return RequestContext
- Ensures validated context is used immediately without race window
- Prevents removed members from sending messages during revalidation gap

M-2: Model Manager cache workspace isolation (VERIFIED)
- Confirmed _CacheKey already uses 4-tuple: (instance, workspace, generation, resource)
- Cache is properly scoped per workspace, no cross-tenant leakage possible
- No code change needed, documented as working correctly

M-3: Invitation lock workspace scoping (FIXED)
- Changed lock key from token_digest to workspace_uuid:token_digest
- Prevents DoS where attacker locks token in Workspace A to block Workspace B
- Locks now isolated per workspace

All MEDIUM severity findings from security review now resolved.

* fix(cloud): unblock tenant CI and enforce knowledge quotas

* fix(tenancy): scope rerank model sync

---------

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

src/langbot/pkg/platform/sources/line.py

@@ -13,6 +13,7 @@ import langbot_plugin.api.entities.builtin.platform.message as platform_message
 import langbot_plugin.api.entities.builtin.platform.events as platform_events
 import langbot_plugin.api.entities.builtin.platform.entities as platform_entities
 from ..logger import EventLogger
+from ...utils import bounded_executor
 
 
 from linebot.v3 import WebhookHandler
@@ -30,6 +31,14 @@ from linebot.v3.webhooks import (
 from linebot.v3.webhook import WebhookParser
 from linebot.v3.messaging import MessagingApiBlob
 
+MAX_LINE_MEDIA_BYTES = 10 * 1024 * 1024
+
+
+def _validate_line_media_content(content: bytes) -> bytes:
+    if len(content) > MAX_LINE_MEDIA_BYTES:
+        raise ValueError(f'LINE media exceeds the {MAX_LINE_MEDIA_BYTES}-byte limit')
+    return content
+
 
 class LINEMessageConverter(abstract_platform_adapter.AbstractMessageConverter):
     @staticmethod
@@ -63,9 +72,13 @@ class LINEMessageConverter(abstract_platform_adapter.AbstractMessageConverter):
         elif isinstance(message.message, VideoMessageContent):
             pass
         elif isinstance(message.message, ImageMessageContent):
-            message_content = MessagingApiBlob(bot_client).get_message_content(message.message.id)
+            message_content = await asyncio.to_thread(
+                MessagingApiBlob(bot_client).get_message_content,
+                message.message.id,
+            )
+            _validate_line_media_content(message_content)
 
-            base64_string = base64.b64encode(message_content).decode('utf-8')
+            base64_string = await asyncio.to_thread(lambda: base64.b64encode(message_content).decode('utf-8'))
 
             # 如果需要Data URI格式（用于直接嵌入HTML等）
             # 首先需要知道图片类型，LINE图片通常是JPEG
@@ -173,20 +186,22 @@ class LINEAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
 
         for content in content_list:
             if content['type'] == 'text':
-                self.bot.reply_message_with_http_info(
+                await asyncio.to_thread(
+                    self.bot.reply_message_with_http_info,
                     ReplyMessageRequest(
                         reply_token=message_source.source_platform_object.reply_token,
                         messages=[TextMessage(text=content['content'])],
-                    )
+                    ),
                 )
             elif content['type'] == 'image':
                 # LINE ImageMessage requires original_content_url and preview_image_url
                 image_url = content['image']
-                self.bot.reply_message_with_http_info(
+                await asyncio.to_thread(
+                    self.bot.reply_message_with_http_info,
                     ReplyMessageRequest(
                         reply_token=message_source.source_platform_object.reply_token,
                         messages=[ImageMessage(original_content_url=image_url, preview_image_url=image_url)],
-                    )
+                    ),
                 )
 
     async def is_muted(self, group_id: int) -> bool:
@@ -266,4 +281,5 @@ class LINEAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
         await keep_alive()
 
     async def kill(self) -> bool:
-        pass
+        await bounded_executor.run_blocking_cleanup(self.api_client.close)
+        return True