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。

apps/server/internal/docs/assets/docs.css

@@ -0,0 +1,39 @@
+:root {
+  --bg: #0e1116; --panel: #151a21; --border: #243044;
+  --text: #e6edf7; --muted: #8b9bb4; --accent: #3b82f6;
+}
+* { box-sizing: border-box; }
+body { margin: 0; font: 13px/1.55 ui-sans-serif, system-ui, sans-serif; background: var(--bg); color: var(--text); }
+.top {
+  height: 44px; border-bottom: 1px solid var(--border); background: var(--panel);
+  display: flex; align-items: center; justify-content: space-between; padding: 0 16px;
+}
+.brand { display: flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; font-weight: 600; }
+.brand em { color: var(--muted); font-style: normal; font-weight: 500; }
+.logo {
+  width: 24px; height: 24px; border-radius: 6px; background: var(--accent);
+  display: grid; place-items: center; font-size: 10px; font-weight: 700; color: #fff;
+}
+.top a { color: var(--muted); text-decoration: none; font-size: 12.5px; }
+.layout { display: flex; min-height: calc(100vh - 44px); }
+.side {
+  width: 200px; border-right: 1px solid var(--border); padding: 12px 10px;
+  background: var(--panel); display: flex; flex-direction: column; gap: 2px;
+}
+.nav-link {
+  display: block; padding: 6px 8px; border-radius: 6px; color: var(--muted);
+  text-decoration: none; font-size: 12.5px;
+}
+.nav-link:hover { color: var(--text); background: #1a2230; }
+.nav-link.active { color: var(--text); background: color-mix(in srgb, var(--accent) 18%, transparent); }
+.content { flex: 1; padding: 24px 28px; max-width: 720px; }
+.content h1 { font-size: 20px; margin: 0 0 14px; }
+.content h2 { font-size: 15px; margin: 22px 0 8px; }
+.content p, .content li { color: #c5d0e0; }
+.content code, .content pre {
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px;
+}
+.content pre {
+  background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
+}
+.content code { background: #1a2230; padding: 1px 5px; border-radius: 4px; }