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/handlers/instance.ts

@@ -0,0 +1,58 @@
+import electron from 'electron';
+import { createInstance, listInstances, deleteInstance, getInstanceInfo } from '../core/instance';
+
+const { ipcMain } = electron;
+
+export function registerInstanceHandlers() {
+  ipcMain.handle('instance:create', async (_event, payload: {
+    name: string;
+    gamePath: string;
+    mcVersion: string;
+    loaderType?: string;
+    loaderVersion?: string;
+    javaPath?: string;
+    memory?: { min?: string; max?: string };
+  }) => {
+    try {
+      const data = await createInstance(
+        payload.name,
+        payload.gamePath,
+        payload.mcVersion,
+        payload.loaderType,
+        payload.loaderVersion,
+        payload.javaPath,
+        payload.memory
+      );
+      return { success: true, data, error: null };
+    } catch (e: unknown) {
+      return { success: false, data: null, error: String(e) };
+    }
+  });
+
+  ipcMain.handle('instance:list', async (_event, payload: { instancesPath: string }) => {
+    try {
+      const data = await listInstances(payload.instancesPath);
+      return { success: true, data, error: null };
+    } catch (e: unknown) {
+      return { success: false, data: null, error: String(e) };
+    }
+  });
+
+  ipcMain.handle('instance:delete', async (_event, payload: { name: string; instancesPath: string }) => {
+    try {
+      const data = await deleteInstance(payload.name, payload.instancesPath);
+      return { success: true, data, error: null };
+    } catch (e: unknown) {
+      return { success: false, data: null, error: String(e) };
+    }
+  });
+
+  ipcMain.handle('instance:info', async (_event, payload: { name: string; instancesPath: string }) => {
+    try {
+      const data = await getInstanceInfo(payload.name, payload.instancesPath);
+      return { success: true, data, error: null };
+    } catch (e: unknown) {
+      return { success: false, data: null, error: String(e) };
+    }
+  });
+}