refactor(providers): move auth status routes under provider API

Move provider authentication status endpoints out of the legacy `/api/cli` route
namespace so auth status is exposed through the same provider module that owns
provider auth and MCP behavior.

Add `GET /api/providers/:provider/auth/status` to the provider router and route
it through the provider auth service. Remove the old `cli-auth` route file and
`/api/cli` mount now that provider auth status is handled by the unified provider
API.

Update the frontend provider auth endpoint map to call the new provider-scoped
routes and rename the endpoint constant to reflect that it is no longer CLI
specific.

server/routes/cli-auth.js

@@ -1,35 +0,0 @@
-import express from 'express';
-
-import { providerAuthService } from '../modules/providers/services/provider-auth.service.js';
-
-const router = express.Router();
-
-/**
- * Creates a status route handler for one provider while preserving the existing
- * /api/cli/<provider>/status endpoint shape.
- */
-function createProviderStatusHandler(providerName) {
-  return async (req, res) => {
-    try {
-      const status = await providerAuthService.getProviderAuthStatus(providerName);
-      return res.json(status);
-    } catch (error) {
-      console.error(`Error checking ${providerName} auth status:`, error);
-      return res.status(500).json({
-        installed: false,
-        provider: providerName,
-        authenticated: false,
-        email: null,
-        method: null,
-        error: error instanceof Error ? error.message : 'Failed to check provider auth status',
-      });
-    }
-  };
-}
-
-router.get('/claude/status', createProviderStatusHandler('claude'));
-router.get('/cursor/status', createProviderStatusHandler('cursor'));
-router.get('/codex/status', createProviderStatusHandler('codex'));
-router.get('/gemini/status', createProviderStatusHandler('gemini'));
-
-export default router;