perf(parcel-sync): make GisFeature groupBy opt-in on /api/eterra/uats

The groupBy query scanning the entire GisFeature table (~30k+ rows)
was blocking the UAT list API for 25+ seconds on every page load.
Feature counts are now opt-in via ?features=true query param.
Default response is instant (just GisUat table, no joins).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/api/eterra/uats/route.ts

@@ -119,31 +119,33 @@ function unwrapArray(data: any): any[] {
 /*  No eTerra credentials needed — instant response.                   */
 /* ------------------------------------------------------------------ */
 
-export async function GET() {
+export async function GET(req: Request) {
   try {
-    // Fetch UATs and local feature counts in parallel
-    const [rows, featureCounts] = await Promise.all([
-      prisma.gisUat.findMany({ orderBy: { name: "asc" } }),
-      prisma.gisFeature
-        .groupBy({
-          by: ["siruta"],
-          _count: { id: true },
-        })
-        .then((groups) => {
-          const map = new Map<string, number>();
-          for (const g of groups) {
-            map.set(g.siruta, g._count.id);
-          }
-          return map;
-        }),
-    ]);
+    const url = new URL(req.url);
+    const withFeatures = url.searchParams.get("features") === "true";
+
+    const rows = await prisma.gisUat.findMany({ orderBy: { name: "asc" } });
+
+    // Feature counts are expensive (scans entire GisFeature table)
+    // Only include when explicitly requested
+    let featureCounts: Map<string, number> | null = null;
+    if (withFeatures) {
+      const groups = await prisma.gisFeature.groupBy({
+        by: ["siruta"],
+        _count: { id: true },
+      });
+      featureCounts = new Map<string, number>();
+      for (const g of groups) {
+        featureCounts.set(g.siruta, g._count.id);
+      }
+    }
 
     const uats: UatResponse[] = rows.map((r) => ({
       siruta: r.siruta,
       name: r.name,
       county: r.county ?? "",
       workspacePk: r.workspacePk ?? 0,
-      localFeatures: featureCounts.get(r.siruta) ?? 0,
+      localFeatures: featureCounts?.get(r.siruta) ?? 0,
     }));
 
     // Populate in-memory workspace cache for search route