feat: add 5s timeout and warning log for station name search (refs #141)

Add 5000ms timeout to Places Text Search API call in searchStationByName.
Timeout errors log a warning instead of error and return null gracefully.
Add timeout test case to station-matching unit tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/features/stations/external/google-maps/google-maps.client.ts

@@ -128,6 +128,7 @@ export class GoogleMapsClient {
             type: 'gas_station',
             key: this.apiKey,
           },
+          timeout: 5000,
         }
       );
 
@@ -145,8 +146,12 @@ export class GoogleMapsClient {
 
       await cacheService.set(cacheKey, station, this.cacheTTL);
       return station;
-    } catch (error) {
+    } catch (error: any) {
+      if (error.code === 'ECONNABORTED' || error.message?.includes('timeout')) {
+        logger.warn('Station name search timed out', { merchantName, timeoutMs: 5000 });
+      } else {
         logger.error('Station name search failed', { error, merchantName });
+      }
       return null;
     }
   }

backend/src/features/stations/tests/unit/station-matching.test.ts

@@ -32,6 +32,7 @@ import { GoogleMapsClient } from '../../external/google-maps/google-maps.client'
 import { StationsService } from '../../domain/stations.service';
 import { StationsRepository } from '../../data/stations.repository';
 import { googleMapsClient } from '../../external/google-maps/google-maps.client';
+import { logger } from '../../../../core/logging/logger';
 import { mockStations } from '../fixtures/mock-stations';
 
 describe('Station Matching from Receipt', () => {
@@ -162,6 +163,23 @@ describe('Station Matching from Receipt', () => {
       expect(result).toBeNull();
     });
 
+    it('should return null with logged warning on Places API timeout', async () => {
+      const timeoutError = new Error('timeout of 5000ms exceeded') as any;
+      timeoutError.code = 'ECONNABORTED';
+      mockAxios.get.mockRejectedValue(timeoutError);
+
+      const mockLogger = logger as jest.Mocked<typeof logger>;
+
+      const result = await client.searchStationByName('Shell');
+
+      expect(result).toBeNull();
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Station name search timed out',
+        expect.objectContaining({ merchantName: 'Shell', timeoutMs: 5000 })
+      );
+      expect(mockLogger.error).not.toHaveBeenCalled();
+    });
+
     it('should include rating and photo reference when available', async () => {
       mockAxios.get.mockResolvedValue({
         data: {