Use BMCLAPI mirror & update build

Route Minecraft/Fabric/Forge downloads through BMCLAPI mirror and update installer logic. Added mirror rewrite utility (rewriteToMirror), mirror-aware downloadFile, and mirrorFetch; switched version manifest and metadata endpoints to bmclapi2.bangbang93.com and wired maven/assets hosts into xmcl/installer calls. Cleaned up compiled electron JS files and consolidated runtime files under electron-dist; updated electron-builder.yml (compression, asar, NSIS settings, license/installer assets and languages). Minor env/path changes (VITE_APP_ICON paths), added .npmrc (electron_mirror), new Koring.yml, pnpm-workspace and public installer assets. Also added/updated multiple frontend pages, store components, and TypeScript handlers to integrate the changes.

electron/handlers/instance.ts

@@ -12,6 +12,7 @@ import {
   getForgeVersionList,
   getFabricVersionList,
   getQuiltVersionList,
+  scanGameDirectories,
   type InstanceRuntime,
   type InstanceConfig,
 } from '../core/instance';
@@ -194,4 +195,14 @@ export function registerInstanceHandlers(win: WinRef) {
       return { success: false, data: null, error: String(e) };
     }
   });
+
+  // 扫描游戏目录中的已安装版本
+  ipcMain.handle('instance:scan-dir', async (_event, payload: { gamePath: string }) => {
+    try {
+      const versions = scanGameDirectories(payload.gamePath);
+      return { success: true, data: { versions }, error: null };
+    } catch (e: unknown) {
+      return { success: false, data: null, error: String(e) };
+    }
+  });
 }