fix(osm): stop using public Overpass by default (#648) (#742)

Traffic roads come from OpenFreeMap vector tiles, or TomTom flow tiles with a
key (Hybrid by default). Military areas use OpenFreeMap polygons with a bundled
worldwide name index; wide views show named points. ALPR reads an hourly
OpenStreetMap extract. Cockpit place context and country, state and US county
outlines use bundled Natural Earth and US Census data. Overpass is used only
when an operator configures their own endpoint.

Also: camera arrivals no longer land below ground, keyless terrain retries on
429, bounded relation geometry for configured Overpass, one shared
OpenStreetMap credit, and separate tile and API transports for embedders.

Co-authored-by: theGaryLarson <[email protected]>
Co-authored-by: Milan Khanal <[email protected]>

src/services/terrainHeights.js

@@ -172,12 +172,12 @@ export function createTerrainHeights({
    * @param {Array<{key: string, lat: number, lon: number}>} chunk
    * @returns {Promise<Map<string, number>>} key -> ellipsoid height (m)
    */
-  async function fetchChunk(chunk) {
+  async function fetchChunk(chunk, requestSignal = signal) {
     // lon,lat order (matches the proxy's documented `points=lon,lat;…` contract
     // and Task 2's implementation).
     const results = await source.getHeights(chunk, {
-      signal: signal
-        ? AbortSignal.any([signal, AbortSignal.timeout(30000)])
+      signal: requestSignal
+        ? AbortSignal.any([requestSignal, AbortSignal.timeout(30000)])
         : AbortSignal.timeout(30000),
     });
     const body = { results };
@@ -239,8 +239,15 @@ export function createTerrainHeights({
    * @returns {Promise<Array<{ellipsoid:number, source:'reearth'|'geoid-fallback'}>>}
    *   Same length and order as `coords`.
    */
-  async function resolveEllipsoidalGround(coords) {
-    signal?.throwIfAborted();
+  async function resolveEllipsoidalGround(
+    coords,
+    { signal: consumerSignal } = {},
+  ) {
+    const requestSignal =
+      signal && consumerSignal
+        ? AbortSignal.any([signal, consumerSignal])
+        : consumerSignal || signal;
+    requestSignal?.throwIfAborted();
     if (!Array.isArray(coords) || coords.length === 0) return [];
 
     // Build the per-input work list (key + original index) up front so the
@@ -293,8 +300,8 @@ export function createTerrainHeights({
     for (let i = 0; i < uncached.length; i += CHUNK_SIZE) {
       const chunk = uncached.slice(i, i + CHUNK_SIZE);
       try {
-        const resolved = await fetchChunk(chunk);
-        signal?.throwIfAborted();
+        const resolved = await fetchChunk(chunk, requestSignal);
+        requestSignal?.throwIfAborted();
         for (const item of chunk) {
           const ellipsoid = resolved.get(item.key);
           // Round 6: only a FINITE value may be cached as 'reearth'. A point
@@ -310,13 +317,13 @@ export function createTerrainHeights({
           }
         }
       } catch {
-        signal?.throwIfAborted();
+        requestSignal?.throwIfAborted();
         // Proxy down (or cold cache had nothing to serve-stale) — fall back to
         // geoid math for every point in this chunk. `ensureGeoidReady()` is
         // awaited lazily, only on the fallback path, so the common (proxy
         // healthy) case never pays for the geoid grid's dynamic import.
         await ensureGeoidReady();
-        signal?.throwIfAborted();
+        requestSignal?.throwIfAborted();
         for (const item of chunk) {
           const ellipsoid = geoidFallback(
             item.lat,