feat: 重构前后端架构，添加Go后端和Python Agent服务

- 新增 Go 语言后端服务(server/)，包含用户认证、Agent管理、数据库连接等API
- 新增 Python Agent 服务(agent/)，实现Agent核心逻辑和工具集
- 前端从原生HTML迁移到Vue.js框架(web/src/)
- 添加 Docker Compose 支持(docker-compose.yml)
- 添加项目架构文档(docs/ARCHITECTURE.md)
- 添加环境变量示例(.env.example)和本地启动脚本(start-local.ps1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/resources/db_info/101fbee1-8400-46ae-b83b-e3898e4888b6.json

@@ -0,0 +1,22 @@
+{
+  "database_id": "101fbee1-8400-46ae-b83b-e3898e4888b6",
+  "database_name": "123",
+  "db_type": "mysql",
+  "tables": [
+    {
+      "id": "042db4ca-512f-4ee9-aacb-2d7ff1bc2193",
+      "database_id": "101fbee1-8400-46ae-b83b-e3898e4888b6",
+      "parent_table": "scores",
+      "sub_table_name": "scores",
+      "sub_table_comment": "",
+      "mapping_type": "",
+      "relation_field": "",
+      "relation_type": "",
+      "fields": null,
+      "ddl": "CREATE TABLE `scores` (\n`id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '分数id'\n  `student_id` int(10) unsigned NOT NULL,\n  `subject` varchar(50) NOT NULL COMMENT '科目',\n  `score` double DEFAULT NULL COMMENT '分数',\n  `teacher_id` int(10) unsigned DEFAULT NULL,\n  `exam_date` date DEFAULT NULL COMMENT '考试日期',\n  `created_at` datetime DEFAULT CURRENT_TIMESTAMP,\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB AUTO_INCREMENT=48 DEFAULT CHARSET=utf8mb4",
+      "created_at": "2026-03-06T16:23:31.097+08:00",
+      "updated_at": "2026-03-06T16:23:31.097+08:00"
+    }
+  ],
+  "updated_at": "2026-03-06T16:23:31.1477776+08:00"
+}