feat(FN-010): implement code-server spawn service with Docker Compose

- Add SpawnService with container lifecycle (spawn/stop/status)
- Generate Docker Compose services from tool manifests
- Integrate Traefik label generation with subdomain routing
- Mount workspace, config, and SSH key volumes
- Add container status polling and health checks
- Enhance tool instance API with spawn/stop/start/status endpoints
- Add Traefik forwardAuth middleware for auth proxy
- Update code-server manifest with runtime configuration

apps/api/app/schemas/tool_instance.py

@@ -10,6 +10,7 @@ class ToolInstanceBase(OrmBase):
     container_id: str | None = None
     subdomain: str | None = None
     config_override: dict[str, Any] | None = None
+    traefik_labels: dict[str, Any] | None = None
 
 
 class ToolInstanceCreate(ToolInstanceBase):
@@ -28,3 +29,4 @@ class ToolInstanceUpdate(OrmBase):
     container_id: str | None = None
     subdomain: str | None = None
     config_override: dict[str, Any] | None = None
+    traefik_labels: dict[str, Any] | None = None