feat: telegram commands, app settings, bot polling, webhook handling, UI improvements

Adds telegram bot command system with 13 commands (search, latest, random, etc.),
webhook/polling handlers, rate limiting, app settings page, and various UI/UX
improvements across all entity pages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/server/src/notify_bridge_server/main.py

@@ -24,6 +24,8 @@ from .api.telegram_bots import router as telegram_bots_router
 from .api.users import router as users_router
 from .api.status import router as status_router
 from .api.template_vars import router as template_vars_router
+from .api.app_settings import router as app_settings_router
+from .commands.webhook import router as webhook_router, set_webhook_secret
 
 
 @asynccontextmanager
@@ -36,6 +38,12 @@ async def lifespan(app: FastAPI):
     await migrate_schema(engine)
     await migrate_tracker_targets(engine)
     await _seed_default_templates()
+    # Configure webhook secret from DB setting (falls back to env var)
+    from sqlmodel.ext.asyncio.session import AsyncSession as _AS
+    from .api.app_settings import get_setting as _get_setting
+    async with _AS(engine) as _session:
+        _secret = await _get_setting(_session, "telegram_webhook_secret")
+    set_webhook_secret(_secret or None)
     from .services.scheduler import start_scheduler
     await start_scheduler()
     yield
@@ -55,6 +63,8 @@ app.include_router(targets_router)
 app.include_router(telegram_bots_router)
 app.include_router(users_router)
 app.include_router(status_router)
+app.include_router(app_settings_router)
+app.include_router(webhook_router)
 
 
 @app.get("/api/health")