feat: OpsxDB 桌面数据库客户端首版入库

含工作台/连库多引擎字段与 SSH·SSL、结果编辑、Redis 键浏览、
Tauri 桌面与 docs/落地页；排除本地构建产物与 sidecar 二进制。

tests/ui-reg-conn/result-engines.json

@@ -0,0 +1,25 @@
+{
+  "verdict": "通过",
+  "pass": [
+    "MySQL 端口 3306",
+    "PostgreSQL 端口 5432",
+    "PostgreSQL 默认 postgres",
+    "SQL Server 端口 1433",
+    "SQL Server 默认 master",
+    "Oracle 端口 1521",
+    "Oracle 默认 ORCL",
+    "Redis 端口 6379",
+    "Redis常规无DB索引",
+    "服务端失败前缀 SSH:/数据库:"
+  ],
+  "fail": [],
+  "notes": [],
+  "priorRedisSshPassCount": 25,
+  "priorFails": [
+    "选不中 MySQL",
+    "选不中 PostgreSQL",
+    "选不中 SQL Server",
+    "选不中 Oracle",
+    "locator.click: Timeout 12000ms exceeded.\nCall log:\n  - waiting for getByText('Redis', { exact: true }).first()\n    - locator resolved to <div class=\"truncate text-[14px] font-semibold leading-tight\">Redis</div>\n  - attempting click action\n    2 × waiting for element to be visible, enabled and stable\n      - element is visible, enabled and stable\n      - scrolling into view if needed\n      - done scrolling\n      - <div aria-modal=\"true\" role=\"alertdialog\" aria-labelledby=\"notify-title-1fc21b9b-31"
+  ]
+}