Feat: Show Gemini Usage in usage dropdown and mobile sidebar

apps/server/src/routes/gemini/index.ts

@@ -0,0 +1,60 @@
+import { Router, Request, Response } from 'express';
+import { GeminiProvider } from '../../providers/gemini-provider.js';
+import { getGeminiUsageService } from '../../services/gemini-usage-service.js';
+import { createLogger } from '@automaker/utils';
+
+const logger = createLogger('Gemini');
+
+export function createGeminiRoutes(): Router {
+  const router = Router();
+
+  // Get current usage/quota data from Google Cloud API
+  router.get('/usage', async (_req: Request, res: Response) => {
+    try {
+      const usageService = getGeminiUsageService();
+      const usageData = await usageService.fetchUsageData();
+
+      res.json(usageData);
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Unknown error';
+      logger.error('Error fetching Gemini usage:', error);
+
+      // Return error in a format the UI expects
+      res.status(200).json({
+        authenticated: false,
+        authMethod: 'none',
+        usedPercent: 0,
+        remainingPercent: 100,
+        lastUpdated: new Date().toISOString(),
+        error: `Failed to fetch Gemini usage: ${message}`,
+      });
+    }
+  });
+
+  // Check if Gemini is available
+  router.get('/status', async (_req: Request, res: Response) => {
+    try {
+      const provider = new GeminiProvider();
+      const status = await provider.detectInstallation();
+
+      const authMethod =
+        (status as any).authMethod ||
+        (status.authenticated ? (status.hasApiKey ? 'api_key' : 'cli_login') : 'none');
+
+      res.json({
+        success: true,
+        installed: status.installed,
+        version: status.version || null,
+        path: status.path || null,
+        authenticated: status.authenticated || false,
+        authMethod,
+        hasCredentialsFile: (status as any).hasCredentialsFile || false,
+      });
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Unknown error';
+      res.status(500).json({ success: false, error: message });
+    }
+  });
+
+  return router;
+}