feat(deploy): 在线更新 - 新增后台检查、强制备份迁移与失败自动回退

web/vite.config.ts

@@ -5,7 +5,7 @@ import react from "@vitejs/plugin-react";
 import { defineConfig } from "vite";
 
 const webDir = dirname(fileURLToPath(import.meta.url));
-const appVersion = readFileSync(resolve(webDir, "../VERSION"), "utf8").trim();
+const appVersion = process.env.CANVAS_BUILD_VERSION?.trim() || readFileSync(resolve(webDir, "../VERSION"), "utf8").trim();
 const appChangelog = readFileSync(resolve(webDir, "../CHANGELOG.md"), "utf8");
 const apiProxyTarget = process.env.VITE_API_PROXY_TARGET?.trim() || "http://127.0.0.1:8080";
 
@@ -14,6 +14,7 @@ export default defineConfig({
     define: {
         __APP_VERSION__: JSON.stringify(appVersion),
         __APP_CHANGELOG__: JSON.stringify(appChangelog),
+        "import.meta.env.VITE_APP_VERSION": JSON.stringify(appVersion),
     },
     server: {
         proxy: {