feat: light app center and iframe refactor

offline-backend-20260512/backend/app/gateway/app.py

@@ -40,6 +40,7 @@ from app.gateway.routers import (
     html_page_favorites,
     intent,
     knowledge,
+    light_apps,
     llm_metrics,
     mcp,
     memory,
@@ -1321,6 +1322,9 @@ This gateway provides custom endpoints for models, MCP configuration, skills, an
     # Global business → agent / chain mapping at /api/business-mapping
     app.include_router(business_mapping.router)
 
+    # Light-app registry (轻应用中心) at /api/light-apps
+    app.include_router(light_apps.router)
+
     # Standalone parallel multi-agent panel: fan-out streaming + saved tasks
     app.include_router(parallel_agents.router)
     app.include_router(parallel_agent_tasks.router)