feat: add django user center auth integration

backend/app/api/auth.py

@@ -0,0 +1,22 @@
+from fastapi import APIRouter, Depends
+
+from app.core.response import ApiResponse, ok
+from app.core.user_context import UserContext, get_user_context
+from app.schemas.auth import AuthMeResponse
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=ApiResponse[AuthMeResponse])
+async def auth_me(ctx: UserContext = Depends(get_user_context)):
+    """当前用户：返回经 Django 用户中心或 Demo Header 标准化后的用户信息。"""
+    return ok(
+        AuthMeResponse(
+            user_id=ctx.user_id,
+            source=ctx.auth_source,
+            username=ctx.username,
+            display_name=ctx.display_name,
+            tenant_id=ctx.tenant_id,
+            role=ctx.role,
+        )
+    )

backend/app/api/router.py

@@ -1,9 +1,10 @@
 from fastapi import APIRouter
 
-from app.api import agent, cases, evaluations, imports, knowledge, llm_test, sessions
+from app.api import agent, auth, cases, evaluations, imports, knowledge, llm_test, sessions
 
 api_router = APIRouter()
 api_router.include_router(agent.router, tags=["agent"])
+api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
 api_router.include_router(cases.router, prefix="/cases", tags=["cases"])
 api_router.include_router(sessions.router, prefix="/sessions", tags=["sessions"])
 api_router.include_router(evaluations.router, prefix="/evaluations", tags=["evaluations"])