Add initial project configuration and setup for Reference Board Viewer application. Include EditorConfig for consistent coding styles, pre-commit hooks for linting and formatting, Docker Compose for local development with PostgreSQL and MinIO, and a Nix flake for development environment management. Establish CI/CD pipeline for automated testing and deployment.

backend/app/core/middleware.py

@@ -0,0 +1,29 @@
+"""CORS and other middleware configuration."""
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.middleware.trustedhost import TrustedHostMiddleware
+
+from app.core.config import settings
+
+
+def setup_middleware(app: FastAPI) -> None:
+    """Configure application middleware."""
+
+    # CORS middleware
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=settings.CORS_ORIGINS,
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    # Security headers (optional, add more as needed)
+    # Note: TrustedHostMiddleware not added by default in dev
+    # Uncomment for production:
+    # app.add_middleware(
+    #     TrustedHostMiddleware,
+    #     allowed_hosts=["yourdomain.com", "*.yourdomain.com"]
+    # )
+