✨ feat(driver-proxy): 新增ClickHouse数据源并提供全局代理独立入口

- 新增 ClickHouse 可选驱动实现与 optional-driver-agent provider，补齐驱动注册与清单配置
- 补齐 ClickHouse 连接与 SQL 适配：连接默认端口/用户、LIMIT、标识符引用、只读编辑限制
- 新增全局代理后端能力与前端持久化配置，更新检查和驱动网络请求统一走代理客户端

docs/driver-manifest.json

@@ -73,6 +73,12 @@
       "checksumPolicy": "off",
       "downloadUrl": "builtin://activate/tdengine"
     },
+    "clickhouse": {
+      "engine": "go",
+      "version": "2.43.0",
+      "checksumPolicy": "off",
+      "downloadUrl": "builtin://activate/clickhouse"
+    },
     "postgres": {
       "engine": "go",
       "version": "1.11.1",