"feat: Implement Docker Compose for backend and frontend servers"

frontend/env.frontend

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+# 🎨 MYP Frontend - Standalone Server Konfiguration
+# Umgebungsvariablen ausschließlich für den Frontend-Server
+
+# === NODE.JS KONFIGURATION ===
+NODE_ENV=production
+NEXT_TELEMETRY_DISABLED=1
+
+# === FRONTEND SERVER ===
+PORT=3000
+HOSTNAME=0.0.0.0
+FRONTEND_URL=http://localhost:3000
+
+# === BACKEND API KONFIGURATION ===
+# Backend-Server Verbindung (HTTP)
+BACKEND_API_URL=http://localhost:5000/api
+BACKEND_HOST=localhost:5000
+NEXT_PUBLIC_API_URL=http://localhost:5000/api
+NEXT_PUBLIC_BACKEND_HOST=localhost:5000
+
+# === AUTHENTIFIZIERUNG ===
+NEXTAUTH_URL=http://localhost:3000
+NEXTAUTH_SECRET=frontend-auth-secret-2024
+JWT_SECRET=frontend-jwt-secret-2024
+
+# OAuth Provider (falls verwendet)
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+MICROSOFT_CLIENT_ID=
+MICROSOFT_CLIENT_SECRET=
+
+# === DATABASE (Frontend-spezifisch, falls Session Store) ===
+# Hinweis: Frontend sollte normalerweise KEINE direkte DB-Verbindung haben
+# Diese Werte sind nur für Session-Management relevant
+FRONTEND_DB_PATH=db/frontend.db
+
+# === CACHE KONFIGURATION ===
+# Frontend-spezifischer Redis Cache (separater Port!)
+FRONTEND_REDIS_PASSWORD=frontend_cache_password
+FRONTEND_REDIS_HOST=localhost
+FRONTEND_REDIS_PORT=6380
+FRONTEND_REDIS_DB=1
+
+# === CDN KONFIGURATION ===
+CDN_URL=http://localhost:8080
+ASSETS_URL=http://localhost:8080/static
+
+# === SICHERHEIT ===
+# CSP (Content Security Policy)
+CSP_SCRIPT_SRC="'self' 'unsafe-inline' 'unsafe-eval'"
+CSP_STYLE_SRC="'self' 'unsafe-inline'"
+CSP_IMG_SRC="'self' data: https:"
+CSP_CONNECT_SRC="'self' ws: wss: http://localhost:5000"
+
+# === MONITORING ===
+ANALYTICS_ENABLED=true
+ERROR_REPORTING_ENABLED=true
+
+# === ENTWICKLUNG ===
+DEBUG=false
+NEXT_DEBUG=false
+
+# === BUILD KONFIGURATION ===
+ANALYZE=false
+BUNDLE_ANALYZER=false