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。

packages/ui/src/SchemaPane.tsx

@@ -0,0 +1,92 @@
+import { useWorkspaceStore } from "./store";
+
+export function SchemaPane() {
+  const schema = useWorkspaceStore((s) => s.schemaView);
+  const set = useWorkspaceStore((s) => s.set);
+
+  if (!schema) {
+    return (
+      <div className="ops-empty" style={{ minHeight: 120 }}>
+        <h2 style={{ fontSize: "var(--ops-font-sm)" }}>表结构</h2>
+        <p>在对象树点表，或右键「查看结构」。</p>
+      </div>
+    );
+  }
+
+  if (schema.loading) {
+    return (
+      <div className="px-3 py-2 text-[12.5px]" style={{ color: "var(--ops-muted)" }}>
+        加载 {schema.table} 结构…
+      </div>
+    );
+  }
+
+  if (schema.error) {
+    return (
+      <div
+        className="m-1.5 rounded border px-2.5 py-1.5 text-[12.5px]"
+        style={{
+          borderColor: "color-mix(in srgb, var(--ops-danger) 40%, var(--ops-border))",
+          background: "color-mix(in srgb, var(--ops-danger) 10%, transparent)",
+          color: "var(--ops-danger)",
+        }}
+      >
+        {schema.error}
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex min-h-0 flex-1 flex-col">
+      <div className="ops-section-label justify-between border-b">
+        <span>
+          结构 · {schema.database ? `${schema.database}.` : ""}
+          {schema.table}
+        </span>
+        <button
+          type="button"
+          className="normal-case tracking-normal hover:underline"
+          style={{ color: "var(--ops-accent)" }}
+          onClick={() => set("resultTab", "data")}
+        >
+          回结果
+        </button>
+      </div>
+      <div className="min-h-0 flex-1 overflow-auto">
+        {schema.columns.length === 0 ? (
+          <div className="px-3 py-2 text-[12.5px]" style={{ color: "var(--ops-muted)" }}>
+            无列信息
+          </div>
+        ) : (
+          <table className="ops-grid" style={{ width: "100%" }}>
+            <thead>
+              <tr>
+                <th style={{ width: 36 }}>#</th>
+                <th>列名</th>
+                <th>类型</th>
+                <th style={{ width: 64 }}>可空</th>
+                <th>默认值</th>
+              </tr>
+            </thead>
+            <tbody>
+              {schema.columns.map((c, i) => (
+                <tr key={c.name}>
+                  <td className="ops-rownum">{i + 1}</td>
+                  <td>
+                    {c.key === "PRI" ? <span title="主键">🔑 </span> : null}
+                    {c.name}
+                  </td>
+                  <td className="font-mono text-[12px]">{c.type}</td>
+                  <td>{c.nullable ? "YES" : "NO"}</td>
+                  <td className="font-mono text-[12px]" style={{ color: "var(--ops-muted)" }}>
+                    {c.default == null ? <span className="ops-null">NULL</span> : String(c.default)}
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        )}
+      </div>
+    </div>
+  );
+}