Add complete project structure and all files

backend/app/language_middleware.py

@@ -0,0 +1,34 @@
+"""
+Language middleware
+Detects user language from settings and adds to request state
+"""
+
+from fastapi import Request
+from starlette.middleware.base import BaseHTTPMiddleware
+from sqlalchemy.orm import Session
+
+from .db import SessionLocal
+from .models import PanelSettings
+
+
+class LanguageMiddleware(BaseHTTPMiddleware):
+    """Middleware to detect and set language"""
+    
+    async def dispatch(self, request: Request, call_next):
+        # Get language from database settings
+        lang = "ru"  # default
+        
+        try:
+            db = SessionLocal()
+            setting = db.query(PanelSettings).filter(PanelSettings.key == "language").first()
+            if setting:
+                lang = setting.value
+            db.close()
+        except Exception:
+            pass
+        
+        # Store language in request state
+        request.state.lang = lang
+        
+        response = await call_next(request)
+        return response