feat: tasks app, security hardening, mobile fixes, iOS app shell

- Custom SQLite task manager replacing TickTick wrapper
- 73 tasks migrated from TickTick across 15 projects
- RRULE recurrence engine with lazy materialization
- Dashboard tasks widget (desktop sidebar + mobile card)
- Tasks page with project tabs, add/edit/complete/delete
- Security: locked ports to localhost, removed old containers
- Gitea Actions runner configured and all 3 CI jobs passing
- Fixed mobile overflow on dashboard cards
- iOS Capacitor app shell (Second Brain)
- Frontend/backend guide docs for adding new services
- TickTick Google Calendar sync re-authorized

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

gateway/server.py

@@ -283,7 +283,7 @@ class GatewayHandler(ResponseMixin, BaseHTTPRequestHandler):
             self._send_json({"error": "Unknown service"}, 404)
             return
 
-        from config import MINIFLUX_API_KEY, INVENTORY_SERVICE_API_KEY, BUDGET_SERVICE_API_KEY
+        from config import MINIFLUX_API_KEY, INVENTORY_SERVICE_API_KEY, BUDGET_SERVICE_API_KEY, TASKS_SERVICE_API_KEY
         headers = {}
         ct = self.headers.get("Content-Type")
         if ct:
@@ -298,6 +298,11 @@ class GatewayHandler(ResponseMixin, BaseHTTPRequestHandler):
             headers["X-API-Key"] = INVENTORY_SERVICE_API_KEY
         elif service_id == "budget" and BUDGET_SERVICE_API_KEY:
             headers["X-API-Key"] = BUDGET_SERVICE_API_KEY
+        elif service_id == "tasks":
+            # Inject user identity for the task manager
+            if user:
+                headers["X-Gateway-User-Id"] = str(user["id"])
+                headers["X-Gateway-User-Name"] = user.get("display_name", user.get("username", ""))
         elif user:
             svc_token = get_service_token(user["id"], service_id)
             if svc_token: