桌面 GUI 外链修复 + 主题顺序调整（含结构扁平化进行中的工作区基线）

- 集成 tauri-plugin-opener：Cargo/lib.rs/capabilities/npm 四处接线，新增 src/openExternal.ts（桌面走 opener，浏览器回退 window.open，相对路径绝对化）
- 关于页 4 个链接、活动栏官网菜单、代理错误横幅 2 处健康检查链接全部改走 openExternal，桌面端可正常跳转
- 设置→外观 主题顺序调整为 深色/浅色/跟随系统
- release 二进制重编并验证（浏览器实测关于页链接可开文档页）
- 附带工作区中未提交的扁平化重构现状（另一会话进行中）
- homepage 落地页与文档终检通过（8787 / 与 /docs 双 200）

src/components/jsonLines.ts

@@ -0,0 +1,42 @@
+export type JsonLine = {
+  path: string;
+  depth: number;
+  key?: string;
+  kind: "open" | "close" | "value";
+  text: string;
+  tone?: "string" | "number" | "boolean" | "null";
+  foldable?: boolean;
+  expanded?: boolean;
+};
+
+/** Pretty JSON lines retain separators and paths, including after collapsing branches. */
+export function jsonLines(value: unknown, collapsed: ReadonlySet<string> = new Set()): JsonLine[] {
+  const lines: JsonLine[] = [];
+  function visit(current: unknown, path: string, depth: number, key: string | undefined, last: boolean) {
+    const comma = last ? "" : ",";
+    if (current !== null && typeof current === "object") {
+      const array = Array.isArray(current);
+      const entries: [string, unknown][] = array
+        ? current.map((item, index) => [String(index), item])
+        : Object.entries(current);
+      const open = array ? "[" : "{";
+      const close = array ? "]" : "}";
+      if (entries.length === 0) {
+        lines.push({ path, depth, key, kind: "value", text: `${open}${close}${comma}` });
+      } else if (collapsed.has(path)) {
+        lines.push({ path, depth, key, kind: "open", text: `${open}…${close}${comma}`, foldable: true, expanded: false });
+      } else {
+        lines.push({ path, depth, key, kind: "open", text: open, foldable: true, expanded: true });
+        entries.forEach(([childKey, childValue], index) => {
+          visit(childValue, `${path}/${childKey.replace(/~/g, "~0").replace(/\//g, "~1")}`, depth + 1, array ? undefined : childKey, index === entries.length - 1);
+        });
+        lines.push({ path, depth, kind: "close", text: `${close}${comma}` });
+      }
+      return;
+    }
+    const tone = current === null ? "null" : typeof current as "string" | "number" | "boolean";
+    lines.push({ path, depth, key, kind: "value", tone, text: `${JSON.stringify(current)}${comma}` });
+  }
+  visit(value, "$", 0, undefined, true);
+  return lines;
+}