chore: normalize structure and split ipc handlers (#590)

Co-authored-by: Haze <709547807@qq.com>

electron/main/ipc/request-helpers.ts

@@ -0,0 +1,45 @@
+import type { AppSettings } from '../../utils/store';
+
+export type AppRequest = {
+  id?: string;
+  module: string;
+  action: string;
+  payload?: unknown;
+};
+
+export type AppErrorCode = 'VALIDATION' | 'PERMISSION' | 'TIMEOUT' | 'GATEWAY' | 'INTERNAL' | 'UNSUPPORTED';
+
+export type AppResponse = {
+  id?: string;
+  ok: boolean;
+  data?: unknown;
+  error?: {
+    code: AppErrorCode;
+    message: string;
+    details?: unknown;
+  };
+};
+
+export function mapAppErrorCode(error: unknown): AppErrorCode {
+  const msg = error instanceof Error ? error.message.toLowerCase() : String(error).toLowerCase();
+  if (msg.includes('timeout')) return 'TIMEOUT';
+  if (msg.includes('permission') || msg.includes('denied') || msg.includes('forbidden')) return 'PERMISSION';
+  if (msg.includes('gateway')) return 'GATEWAY';
+  if (msg.includes('invalid') || msg.includes('required')) return 'VALIDATION';
+  return 'INTERNAL';
+}
+
+export function isProxyKey(key: keyof AppSettings): boolean {
+  return (
+    key === 'proxyEnabled' ||
+    key === 'proxyServer' ||
+    key === 'proxyHttpServer' ||
+    key === 'proxyHttpsServer' ||
+    key === 'proxyAllServer' ||
+    key === 'proxyBypassRules'
+  );
+}
+
+export function isLaunchAtStartupKey(key: keyof AppSettings): boolean {
+  return key === 'launchAtStartup';
+}