feat: add Google Maps → Email pipeline (Tab 4)

- New Maps page with keyword + region chips, German city presets, query preview, enrichment toggle
- Google Maps Places API (New) service with pagination and deduplication
- maps-enrich job route: Maps search → store raw leads → optional Anymailfinder bulk enrichment
- Settings: Google Maps API key credential card with Places API instructions
- Sidebar: MapPin nav item + googlemaps credential status indicator
- Results: maps job type with MapPin icon (text-green-400)
- Credentials API: added googlemaps to SERVICES array and test endpoint

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

app/api/credentials/test/route.ts

@@ -38,6 +38,21 @@ export async function GET(req: NextRequest) {
         });
         return NextResponse.json({ ok: res.status === 200 });
       }
+      case "googlemaps": {
+        const res = await axios.post(
+          "https://places.googleapis.com/v1/places:searchText",
+          { textQuery: "restaurant", maxResultCount: 1 },
+          {
+            headers: {
+              "X-Goog-Api-Key": key,
+              "X-Goog-FieldMask": "places.id",
+              "Content-Type": "application/json",
+            },
+            timeout: 10000,
+          }
+        );
+        return NextResponse.json({ ok: res.status === 200 });
+      }
       default:
         return NextResponse.json({ ok: false, error: "Unknown service" });
     }