init medical training project

.env.example

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+# ────────── 数据库 ──────────
+DB_NAME=medical_training
+DB_USER=root
+DB_PASSWORD=your-db-password
+DB_HOST=localhost
+DB_PORT=3306
+
+# ────────── Redis ──────────
+REDIS_URL=redis://127.0.0.1:6379/1
+
+# ────────── 短信 ──────────
+SMS_PROVIDER=mock                          # mock | aliyun
+ALIYUN_SMS_ACCESS_KEY_ID=
+ALIYUN_SMS_ACCESS_KEY_SECRET=
+ALIYUN_SMS_SIGN_NAME=医疗训练平台
+ALIYUN_SMS_TEMPLATE_REGISTER=SMS_xxx_001
+ALIYUN_SMS_TEMPLATE_LOGIN=SMS_xxx_002
+ALIYUN_SMS_TEMPLATE_RESET=SMS_xxx_003
+
+# ────────── DeepSeek ──────────
+DEEPSEEK_API_KEY=your-deepseek-api-key
+DEEPSEEK_BASE_URL=https://api.deepseek.com
+DEEPSEEK_MODEL=deepseek-chat
+DEEPSEEK_TIMEOUT_SECONDS=120
+DEEPSEEK_MAX_RETRIES=1