Fix runtime logging and frontend app regressions

backend/apps/cors.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+"""Shared CORS configuration for all microservice apps."""
+
+import os
+from typing import Sequence
+
+from fastapi.middleware.cors import CORSMiddleware
+
+
+def get_cors_origins() -> Sequence[str]:
+    """Get allowed CORS origins from environment variable.
+
+    Defaults to ["*"] for backward compatibility.
+    Set CORS_ALLOWED_ORIGINS env var (comma-separated) in production.
+    """
+    origins = os.getenv("CORS_ALLOWED_ORIGINS", "").strip()
+    if not origins:
+        return ["*"]
+    return [o.strip() for o in origins.split(",") if o.strip()]
+
+
+def add_cors_middleware(app: "FastAPI") -> None:
+    """Add CORS middleware to app with environment-configured origins."""
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=get_cors_origins(),
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )