Scaffold V2 backend foundation

ai_knowledge_base_v2/apps/backend/.env.example

@@ -0,0 +1,18 @@
+APP_NAME=AI Knowledge Base V2 Backend
+APP_ENV=local
+DEBUG=true
+API_PREFIX=/api
+
+DATABASE_URL=mysql+pymysql://ai_kb:ai_kb@127.0.0.1:3306/ai_knowledge_base_v2?charset=utf8mb4
+AUTO_CREATE_TABLES=false
+
+JWT_SECRET_KEY=change-me-in-production
+JWT_ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=43200
+
+MOCK_SMS_ENABLED=true
+MOCK_SMS_CODE=123456
+SMS_CODE_EXPIRE_MINUTES=5
+
+DEFAULT_DAILY_CHAT_LIMIT=100
+DEFAULT_USER_NAME_PREFIX=用户