feat(platform): add skip_pipeline parameter for webhook responses (#1837)

* feat(platform): add skip_pipeline parameter for webhook responses

Add support for skip_pipeline parameter in webhook responses, allowing
webhook targets to instruct LangBot to skip pipeline processing for
specific messages. When a webhook responds with skip_pipeline=true,
the message is treated as a notification only and bypasses the query pool.

Changes:
- webhook_pusher.py: Parse JSON responses and return skip_pipeline flag
- botmgr.py: Check skip_pipeline before adding messages to query pool
- docker-compose.yaml: Add DNS configuration to fix container networking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: webhook crud bug

* chore: revert docker-compose.yaml

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/langbot/pkg/api/http/controller/groups/webhook_mgmt.py

@@ -0,0 +1,49 @@
+import quart
+
+from .. import group
+
+
+@group.group_class('webhook_mgmt', '/api/v1/webhooks')
+class WebhookManagementRouterGroup(group.RouterGroup):
+    async def initialize(self) -> None:
+        @self.route('', methods=['GET', 'POST'])
+        async def _() -> str:
+            if quart.request.method == 'GET':
+                webhooks = await self.ap.webhook_service.get_webhooks()
+                return self.success(data={'webhooks': webhooks})
+            elif quart.request.method == 'POST':
+                json_data = await quart.request.json
+                name = json_data.get('name', '')
+                url = json_data.get('url', '')
+                description = json_data.get('description', '')
+                enabled = json_data.get('enabled', True)
+
+                if not name:
+                    return self.http_status(400, -1, 'Name is required')
+                if not url:
+                    return self.http_status(400, -1, 'URL is required')
+
+                webhook = await self.ap.webhook_service.create_webhook(name, url, description, enabled)
+                return self.success(data={'webhook': webhook})
+
+        @self.route('/<int:webhook_id>', methods=['GET', 'PUT', 'DELETE'])
+        async def _(webhook_id: int) -> str:
+            if quart.request.method == 'GET':
+                webhook = await self.ap.webhook_service.get_webhook(webhook_id)
+                if webhook is None:
+                    return self.http_status(404, -1, 'Webhook not found')
+                return self.success(data={'webhook': webhook})
+
+            elif quart.request.method == 'PUT':
+                json_data = await quart.request.json
+                name = json_data.get('name')
+                url = json_data.get('url')
+                description = json_data.get('description')
+                enabled = json_data.get('enabled')
+
+                await self.ap.webhook_service.update_webhook(webhook_id, name, url, description, enabled)
+                return self.success()
+
+            elif quart.request.method == 'DELETE':
+                await self.ap.webhook_service.delete_webhook(webhook_id)
+                return self.success()