feat: Phase 1-3 全部完成 — 沙盒增强、学情分析、学习路径

backend/.env.example

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+# Database
+DATABASE_URL="mysql://yuzhiran:yuzhiran123@localhost:3306/yuzhiran"
+
+# JWT
+JWT_SECRET=yuzhiran-jwt-secret-2024
+JWT_EXPIRES_IN=2h
+
+# Server
+PORT=4000
+
+# AI Models (OpenAI-compatible)
+OPENAI_API_KEY=
+OPENAI_BASE_URL=https://api.openai.com/v1
+AI_DEFAULT_MODEL=gpt-3.5-turbo
+
+# DeepSeek
+DEEPSEEK_API_KEY=
+DEEPSEEK_BASE_URL=https://api.deepseek.com
+
+# DashScope (通义千问)
+DASHSCOPE_API_KEY=
+DASHSCOPE_BASE_URL=https://dashscope.aliyuncs.com/compatible-mode/v1
+
+# WeChat Pay
+WX_APPID=
+WX_MCHID=
+WX_KEY=
+WX_CERT_PATH=
+WX_CERT_KEY_PATH=
+
+# WeChat Mini Program
+WX_SECRET=