Phase 7: Bot/extension system

Bot accounts (User rows with is_bot=True), scoped API tokens (read:messages,
write:messages, manage:rooms) authenticated via Authorization: Bearer on both
REST and the WS handshake, live bot WebSocket access on the same /ws/chat
endpoint humans use, message editing (WS "edit" envelope -> message_update
broadcast, fans out cross-instance for free via the existing broadcaster),
incoming webhooks (room-scoped, no auth beyond the URL token), and outgoing
webhooks/event subscriptions (HMAC-SHA256 signed, backgrounded delivery,
creation-time SSRF validation against private/loopback/link-local targets).

Token auth is additive, not a parallel system: a bearer-token-authenticated
bot goes through the exact same room-membership/role checks a session-
authenticated human does everywhere; only read:messages/write:messages are
separately scope-gated (the two message endpoints). manage:rooms scope
enforcement, full per-delivery SSRF re-validation, and bot API rate limiting
were explicitly scoped out (confirmed with the repo owner) as disproportionate
to this phase -- documented as known gaps in backend/README.md rather than
silently skipped.

Admin portal gains a Bots tab (create bots, issue/revoke scoped tokens,
cross-room webhook visibility); RoomInfoPanel gains room-scoped webhook/
subscription management, mirroring how invites already work there. The chat
UI also gets a minimal "edit your own message" affordance -- not asked for
by the issue, but the only practical way to exercise the edit pipeline by
hand instead of only via a scripted bot client.

Along the way: fixed a real bug caught while writing the incoming-webhook
test -- offline-push notification relied on the sender being "connected" to
exclude themselves, true for WS-originated messages but not for the new
webhook path, which has no WS connection for the attributed sender at all.
Now explicitly excluded. Also discovered the REST-only test fixture never
triggered ASGI lifespan, so app.state.broadcaster/presence didn't exist for
it; moved their construction out of the lifespan into create_app() itself
(Redis client construction is synchronous/lazy) so both the WS and
REST-only paths always have them.

New tests/test_bots.py, test_message_edit.py, test_webhooks.py (full suite
now 78/78, stable across repeated runs) plus a scripted end-to-end smoke
test (bot WS join/post/edit, incoming webhook, SSRF rejection, outgoing
delivery) and a full browser walkthrough of the new admin/room UI.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/app/routers/admin.py

@@ -14,12 +14,12 @@ from app.schemas.admin import (
     ResetPasswordRequest,
     TransferOwnershipRequest,
 )
+from app.schemas.webhook import EventSubscriptionAdminRead, WebhookIncomingAdminRead
 from app.services.admin_service import (
     CannotActOnSelfError,
     RoomNotFoundError,
     TargetNotRoomMemberError,
     UserNotFoundError,
-    list_audit_log,
     list_rooms_admin,
     list_users,
     reset_user_password,
@@ -28,6 +28,11 @@ from app.services.admin_service import (
     set_user_site_admin,
     transfer_ownership_admin,
 )
+from app.services.audit import list_audit_log
+from app.services.webhook_service import (
+    list_all_event_subscriptions_admin,
+    list_all_incoming_webhooks_admin,
+)
 
 router = APIRouter(prefix="/api/admin", tags=["admin"])
 
@@ -223,3 +228,47 @@ async def list_audit_log_endpoint(
         )
         for e in entries
     ]
+
+
+@router.get("/webhooks/incoming", response_model=list[WebhookIncomingAdminRead])
+async def list_incoming_webhooks_admin_endpoint(
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    require_site_admin(current_user)
+    webhooks = await list_all_incoming_webhooks_admin(db)
+    return [
+        WebhookIncomingAdminRead(
+            id=w.id,
+            room_id=w.room_id,
+            token=w.token,
+            created_by=w.created_by,
+            description=w.description,
+            created_at=w.created_at,
+            room_name=w.room.name,
+            created_by_username=w.creator.username,
+        )
+        for w in webhooks
+    ]
+
+
+@router.get("/event-subscriptions", response_model=list[EventSubscriptionAdminRead])
+async def list_event_subscriptions_admin_endpoint(
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    require_site_admin(current_user)
+    subscriptions = await list_all_event_subscriptions_admin(db)
+    return [
+        EventSubscriptionAdminRead(
+            id=s.id,
+            room_id=s.room_id,
+            event_types=s.event_types,
+            target_url=s.target_url,
+            created_by=s.created_by,
+            created_at=s.created_at,
+            room_name=s.room.name if s.room else None,
+            created_by_username=s.creator.username,
+        )
+        for s in subscriptions
+    ]