Initial commit: PastPaper Master full stack

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

backend/app/services/supabase_client.py

@@ -0,0 +1,13 @@
+from supabase import create_client, Client
+from app.config import get_settings
+
+_client: Client | None = None
+
+
+def get_supabase() -> Client:
+    """获取 Supabase client (service_role，绕过 RLS)"""
+    global _client
+    if _client is None:
+        s = get_settings()
+        _client = create_client(s.supabase_url, s.supabase_service_role_key)
+    return _client