chore: initialize tuhui repository

backend/env.example

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+# 数据库配置
+DATABASE_URL=mysql+pymysql://aishej:aishej123@mysql:3306/aishej
+
+# JWT 配置
+SECRET_KEY=change-this-to-a-random-secret-key-in-production
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=1440
+
+# 文件上传配置
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=52428800
+
+# 水印配置
+WATERMARK_TEXT=爱设计 AiSheji.com
+WATERMARK_OPACITY=128
+
+# 缩略图配置
+THUMBNAIL_SIZE=400
+THUMBNAIL_QUALITY=85
+
+# CORS 配置
+ALLOWED_ORIGINS=http://localhost:5173,http://localhost:3000