Migrate app from Tauri to Electron

Replace the Tauri/sidecar architecture with an Electron main process. Adds an electron/ directory (main, preload, handlers, core integrations for @xmcl/*), electron-builder.yml, TypeScript electron config and declarations, and updated IPC utilities (ipc.ts) so frontend uses ipcRenderer/ipcMain. Removes Tauri sidecar and src-tauri artifacts, deletes sidecar sources and keys, updates .gitignore, VSCode recommendations, package scripts and icons, and updates documentation (README, AGENTS, DEV) and frontend stores/apis to reflect the Electron-based architecture and config/auth persistence changes.

electron-builder.yml

@@ -0,0 +1,27 @@
+appId: com.lingke.koring.launcher
+productName: Koring Launcher
+directories:
+  output: dist-electron
+files:
+  - dist/**
+  - electron/**/*.js
+  - "!electron/**/*.ts"
+win:
+  target: nsis
+  icon: public/icon.ico
+  artifactName: "koring-launcher-${version}-setup.${ext}"
+mac:
+  target: dmg
+  icon: public/icon.png
+linux:
+  target: AppImage
+  icon: public/icon.png
+nsis:
+  oneClick: false
+  allowToChangeInstallationDirectory: true
+  installerIcon: public/icon.ico
+  uninstallerIcon: public/icon.ico
+  installerHeaderIcon: public/icon.ico
+  createDesktopShortcut: true
+  createStartMenuShortcut: true
+  shortcutName: Koring Launcher