feat(mapillary): street-level layer core — coverage, sequences, viewer bridge, query engine

Camera-driven Mapillary coverage (z0–5 overview points from orbit, z11–14
ground-clamped sequence lines below 60 km), per-sequence image cones, an
embedded MapillaryJS viewer bridge with a camera-follow mode, sprite icons
for map features, and a query engine that turns a plan into a streamed
z14 tile fan-out. Registers an on-globe CC BY-SA 4.0 credit while enabled.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

server/providers/mapillary.js

@@ -0,0 +1,24 @@
+import { installMapillaryRoutes } from './mapillary/routes.js';
+
+/**
+ * Vite plugin: Mapillary street-level data.
+ *
+ * Serves cached vector tiles (coverage, point features, traffic signs) with
+ * the Mapillary token added server-side, fans a city-sized bbox out over
+ * z14 feature tiles as an NDJSON stream, turns natural-language requests
+ * into query plans with Claude (ANTHROPIC_API_KEY stays on this machine),
+ * and proxies the MIT-licensed Mapillary sprite icons.
+ */
+function mapillaryProxy() {
+  return {
+    name: 'mapillary-proxy',
+    configureServer(server) {
+      installMapillaryRoutes(server.middlewares);
+    },
+    configurePreviewServer(server) {
+      installMapillaryRoutes(server.middlewares);
+    },
+  };
+}
+
+export { mapillaryProxy };