fix(cliproxy): use backend-aware labels in error messages and API

- Use checkCliproxyUpdate() in checkLatestVersion() for correct repo
- Dynamic error messages based on backend in service-manager
- Dynamic error messages based on backend in cliproxy-executor
- Generic "CLIProxy" message in oauth-process (no backend context)

src/cliproxy/auth/oauth-process.ts

@@ -271,7 +271,7 @@ async function handleTokenNotFound(
 /** Handle process exit with error */
 function handleProcessError(code: number | null, state: ProcessState, headless: boolean): void {
   console.log('');
-  console.log(fail(`CLIProxy Plus auth exited with code ${code}`));
+  console.log(fail(`CLIProxy auth exited with code ${code}`));
   if (state.stderrData && !state.urlDisplayed) {
     console.log(`    ${state.stderrData.trim().split('\n')[0]}`);
   }

src/cliproxy/cliproxy-executor.ts

@@ -724,12 +724,13 @@ export async function execClaudeWithCLIProxy(
         await waitForProxyReady(cfg.port, cfg.timeout, cfg.pollInterval);
         readySpinner.succeed(`CLIProxy ready on port ${cfg.port}`);
       } catch (error) {
-        readySpinner.fail('CLIProxy Plus startup failed');
+        const backendLabel = backend === 'plus' ? 'CLIProxy Plus' : 'CLIProxy';
+        readySpinner.fail(`${backendLabel} startup failed`);
         proxy.kill('SIGTERM');
 
         const err = error as Error;
         console.error('');
-        console.error(fail('CLIProxy Plus failed to start'));
+        console.error(fail(`${backendLabel} failed to start`));
         console.error('');
         console.error('Possible causes:');
         console.error(`  1. Port ${cfg.port} already in use`);

src/cliproxy/service-manager.ts

@@ -281,11 +281,18 @@ export async function ensureCliproxyService(
         proxyProcess = null;
       }
 
+      // Get backend label for error message
+      const { loadOrCreateUnifiedConfig } = await import('../config/unified-config-loader');
+      const { DEFAULT_BACKEND } = await import('./platform-detector');
+      const config = loadOrCreateUnifiedConfig();
+      const backendLabel =
+        (config.cliproxy?.backend ?? DEFAULT_BACKEND) === 'plus' ? 'CLIProxy Plus' : 'CLIProxy';
+
       return {
         started: false,
         alreadyRunning: false,
         port,
-        error: `CLIProxy Plus failed to start within 5s on port ${port}`,
+        error: `${backendLabel} failed to start within 5s on port ${port}`,
       };
     }
 

src/cliproxy/services/binary-service.ts

@@ -75,7 +75,10 @@ export async function checkLatestVersion(backend?: CLIProxyBackend): Promise<Lat
     backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
 
   try {
-    const latestVersion = await fetchLatestCliproxyVersion();
+    // Use checkCliproxyUpdate which is backend-aware (uses correct GitHub repo)
+    const { checkCliproxyUpdate } = await import('../binary-manager');
+    const updateResult = await checkCliproxyUpdate();
+    const latestVersion = updateResult.latestVersion;
     const currentVersion = getInstalledCliproxyVersion(effectiveBackend);
     const updateAvailable = latestVersion !== currentVersion;