新增資料庫、用戶註冊、登入的功能

env.example

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+# 資料庫配置
+DB_HOST=mysql.theaken.com
+DB_PORT=33306
+DB_USER=AI_Platform
+DB_PASSWORD=Aa123456
+DB_NAME=db_AI_Platform
+
+# JWT 配置
+JWT_SECRET=your_jwt_secret_key_here_make_it_long_and_random
+JWT_EXPIRES_IN=7d
+
+# AI助手配置
+NEXT_PUBLIC_DEEPSEEK_API_KEY=your_deepseek_api_key_here
+NEXT_PUBLIC_DEEPSEEK_API_URL=https://api.deepseek.com/v1/chat/completions
+
+# 應用配置
+NEXT_PUBLIC_APP_URL=http://localhost:3000
+NEXTAUTH_URL=http://localhost:3000
+NEXTAUTH_SECRET=your_nextauth_secret_here
+
+# 郵件配置 (可選)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_USER=your_email@gmail.com
+SMTP_PASS=your_email_password
+
+# 文件上傳配置 (可選)
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=10485760
+
+# 快取配置 (可選)
+REDIS_URL=redis://localhost:6379
+
+# 日誌配置
+LOG_LEVEL=info
+LOG_FILE=./logs/app.log