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/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from "next/server";
 import { prisma } from "@/lib/db";
 import { encrypt, decrypt } from "@/lib/utils/encryption";
 
-const SERVICES = ["anymailfinder", "apify", "vayne", "airscale"] as const;
+const SERVICES = ["anymailfinder", "apify", "vayne", "airscale", "googlemaps"] as const;
 
 export async function GET() {
   try {
@@ -14,7 +14,7 @@ export async function GET() {
     return NextResponse.json(result);
   } catch (err) {
     console.error("GET /api/credentials error:", err);
-    return NextResponse.json({ anymailfinder: false, apify: false, vayne: false, airscale: false });
+    return NextResponse.json({ anymailfinder: false, apify: false, vayne: false, airscale: false, googlemaps: false });
   }
 }