Checkpoint React frontend migration

backend/.env.example

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+# Database
+DATABASE_URL=postgresql+asyncpg://user:password@localhost:5432/irt_bank_soal
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=irt_bank_soal
+DB_USER=postgres
+DB_PASSWORD=your_password_here
+
+# FastAPI
+SECRET_KEY=your-secret-key-here-change-in-production
+API_V1_STR=/api/v1
+PROJECT_NAME=IRT Bank Soal
+ENVIRONMENT=development
+ENABLE_ADMIN=false
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=change-me
+ADMIN_SESSION_EXPIRE_SECONDS=3600
+
+# OpenRouter (AI Generation)
+OPENROUTER_API_KEY=your-openrouter-api-key-here
+OPENROUTER_MODEL_QWEN=qwen/qwen2.5-32b-instruct
+OPENROUTER_MODEL_CHEAP=mistralai/mistral-small-2603
+OPENROUTER_MODEL_LLAMA=meta-llama/llama-3.3-70b-instruct
+OPENROUTER_TIMEOUT=30
+
+# WordPress Integration
+WORDPRESS_API_URL=https://your-wordpress-site.com/wp-json
+WORDPRESS_AUTH_TOKEN=your-wordpress-jwt-token
+
+# Redis (Celery)
+REDIS_URL=redis://localhost:6379/0
+CELERY_BROKER_URL=redis://localhost:6379/0
+CELERY_RESULT_BACKEND=redis://localhost:6379/0
+
+# CORS
+ALLOWED_ORIGINS=https://site1.com,https://site2.com,https://site3.com