feat: 完善模型平台相关功能

common/src/common/config.py

@@ -38,6 +38,10 @@ class Settings(BaseSettings):
         default="dev-only-not-for-production",
         description="HS256 secret used by backend's jupyter auth_request.",
     )
+    demo_auth_enabled: bool = Field(
+        default=False,
+        description="Enable the self-hosted UI's short-lived demo session cookie.",
+    )
 
     # ── service identity ──────────────────────────────────────────
     service_name: str = Field(
@@ -148,4 +152,4 @@ def get_settings() -> Settings:
 settings: Settings = get_settings()
 
 
-__all__ = ["Settings", "get_settings", "settings"]
+__all__ = ["Settings", "get_settings", "settings"]