feat: 初始提交（仅核心代码，已排除大文件）

src/server/data_gateway/skills/email_sender/config.json

@@ -0,0 +1,29 @@
+{
+  "_comment": "邮件发送 skill - 对外邮件发送 API",
+  "id": "email_sender",
+  "name": "邮件发送",
+  "enabled": true,
+  "api_key_comment": "对外发送邮件的 API Key，妥善保管",
+  "api_key": "es_hAtXkry70lHtCVMfr0TaQ",
+  "api_key_hash": "sha256:88aee9d336c64b3b9bd86ab97e635604137c5de971b10419bb1801c7bd4eb7b9",
+  "smtp_comment": "SMTP 服务配置（优先级：环境变量 > 此处配置",
+  "smtp": {
+    "host_comment": "SMTP 服务器主机名",
+    "host": "smtp.gmail.com",
+    "port_comment": "SMTP 服务器端口号",
+    "port": 465,
+    "secure_comment": "是否使用 TLS/SSL 加密连接",
+    "secure": true,
+    "auth": {
+      "user_comment": "SMTP 登录用户名（建议通过环境变量 EMAIL_SENDER_SMTP_USER 配置）",
+      "user": "yangdafe@gmail.com",
+      "pass_comment": "SMTP 登录密码或应用专用密码（请通过环境变量 EMAIL_SENDER_SMTP_PASS 配置）",
+      "pass": ""
+    }
+  },
+  "from_comment": "发件人邮箱地址",
+  "from": "yangdafe@gmail.com",
+  "default_to_comment": "默认收件人（当请求参数中未提供时使用）",
+  "default_to": "yangxiangyuan@umer.com.cn",
+  "env_mapping_comment": "环境变量映射（优先级最高）\n  EMAIL_SENDER_SMTP_HOST\n  EMAIL_SENDER_SMTP_PORT\n  EMAIL_SENDER_SMTP_SECURE (true/false)\n  EMAIL_SENDER_SMTP_USER\n  EMAIL_SENDER_SMTP_PASS\n  EMAIL_SENDER_FROM\n  EMAIL_SENDER_DEFAULT_TO"
+}