feat: add desktop updater and release automation

vnt-desktop/src/main.js

@@ -1,4 +1,8 @@
 import { invoke } from "@tauri-apps/api/core";
+import { relaunch } from "@tauri-apps/plugin-process";
+import { check } from "@tauri-apps/plugin-updater";
+
+let pendingUpdate = null;
 
 globalThis.__VNT_DESKTOP__ = true;
 globalThis.__VNT_IPC_REQUEST__ = ({ method, path, body }) =>
@@ -9,6 +13,32 @@ globalThis.__VNT_WEB_ACCESS__ = {
   generateToken: () => invoke("generate_web_token"),
   openUrl: (url) => invoke("open_web_url", { url }),
 };
+globalThis.__VNT_UPDATER__ = {
+  check: async () => {
+    pendingUpdate = await check();
+    if (!pendingUpdate) return null;
+    return {
+      currentVersion: pendingUpdate.currentVersion,
+      version: pendingUpdate.version,
+      date: pendingUpdate.date || "",
+      body: pendingUpdate.body || "",
+    };
+  },
+  downloadAndInstall: async (onProgress) => {
+    if (!pendingUpdate) throw new Error("请先检查更新");
+    let downloaded = 0;
+    let contentLength = 0;
+    await pendingUpdate.downloadAndInstall((event) => {
+      if (event.event === "Started") {
+        contentLength = event.data.contentLength || 0;
+      } else if (event.event === "Progress") {
+        downloaded += event.data.chunkLength;
+      }
+      onProgress?.({ event: event.event, downloaded, contentLength });
+    });
+    await relaunch();
+  },
+};
 
 // Tauri 与 Web 端共用同一个 Vue 应用，这里只负责平台初始化。
 await import("@shared/main.js");