feat(geoportal): add search, basemap switcher, feature info panel, selection + export

Major geoportal enhancements:
- Basemap switcher (OSM/Satellite/Terrain) with ESRI + OpenTopoMap tiles
- Search bar with debounced lookup (UATs by name, parcels by cadastral ref, owners by name)
- Feature info panel showing enrichment data from ParcelSync (cadastru, proprietari, suprafata, folosinta)
- Parcel selection mode with amber highlight + export (GeoJSON/DXF/GPKG via ogr2ogr)
- Next.js /tiles rewrite proxying to Martin (fixes dev + avoids mixed content)
- Fixed MapLibre web worker relative URL resolution (window.location.origin)

API routes: /api/geoportal/search, /api/geoportal/feature, /api/geoportal/export

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

src/modules/geoportal/components/basemap-switcher.tsx

@@ -0,0 +1,44 @@
+"use client";
+
+import { Map, Mountain, Satellite } from "lucide-react";
+import { Button } from "@/shared/components/ui/button";
+import { cn } from "@/shared/lib/utils";
+import type { BasemapId } from "../types";
+
+const BASEMAPS: { id: BasemapId; label: string; icon: typeof Map }[] = [
+  { id: "osm", label: "Harta", icon: Map },
+  { id: "satellite", label: "Satelit", icon: Satellite },
+  { id: "topo", label: "Teren", icon: Mountain },
+];
+
+type BasemapSwitcherProps = {
+  value: BasemapId;
+  onChange: (id: BasemapId) => void;
+};
+
+export function BasemapSwitcher({ value, onChange }: BasemapSwitcherProps) {
+  return (
+    <div className="bg-background/95 backdrop-blur-sm border rounded-lg shadow-lg flex p-0.5 gap-0.5">
+      {BASEMAPS.map((b) => {
+        const Icon = b.icon;
+        const active = value === b.id;
+        return (
+          <Button
+            key={b.id}
+            variant="ghost"
+            size="sm"
+            className={cn(
+              "px-2 py-1 h-7 text-xs gap-1 rounded-md",
+              active && "bg-primary text-primary-foreground hover:bg-primary/90 hover:text-primary-foreground"
+            )}
+            onClick={() => onChange(b.id)}
+            title={b.label}
+          >
+            <Icon className="h-3.5 w-3.5" />
+            <span className="hidden sm:inline">{b.label}</span>
+          </Button>
+        );
+      })}
+    </div>
+  );
+}