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/68b6fb60-eae2-495b-b248-9c46c8d8d6cb.json

@@ -0,0 +1,21 @@
+{
+  "database_id": "68b6fb60-eae2-495b-b248-9c46c8d8d6cb",
+  "database_name": "test-db-4",
+  "db_type": "mysql",
+  "tables": [
+    {
+      "id": "5107d64f-9949-4550-9030-e7e14585f080",
+      "database_id": "68b6fb60-eae2-495b-b248-9c46c8d8d6cb",
+      "parent_table": "database_info",
+      "sub_table_name": "DB<44><42>",
+      "sub_table_comment": "",
+      "mapping_type": "",
+      "relation_field": "",
+      "relation_type": "",
+      "ddl": "CREATE TABLE `database_info` (\n`id` varchar(36) NOT NULL COMMENT '<27><><EFBFBD><EFBFBD>ID'\n`name` varchar(100) NOT NULL COMMENT '<27><><EFBFBD>ݿ<EFBFBD><DDBF><EFBFBD>'\n  `description` varchar(500) DEFAULT NULL,\n  `db_type` varchar(20) NOT NULL,\n`host` varchar(255) NOT NULL COMMENT '<27><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>'\n  `port` bigint NOT NULL,\n  `username` varchar(100) NOT NULL,\n  `password` varchar(255) DEFAULT NULL,\n  `database` varchar(100) DEFAULT NULL,\n  `table_count` bigint DEFAULT '0',\n  `charset` varchar(20) DEFAULT 'utf8mb4',\n  `ssl_mode` varchar(20) DEFAULT NULL,\n  `created_at` datetime(3) DEFAULT NULL,\n  `updated_at` datetime(3) DEFAULT NULL,\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci",
+      "created_at": "2026-03-06T16:00:34.065+08:00",
+      "updated_at": "2026-03-06T16:00:34.065+08:00"
+    }
+  ],
+  "updated_at": "2026-03-06T16:00:34.1176551+08:00"
+}