Merge branch 'main' into feat/voice-geometry

Picks up #1308 (Overpass admission), #114 (Sea Marks and Ski Pistes),
#1206 (radio country coverage) and #1435. Resolutions:
- SECURITY.md: main's rewritten cross-site paragraph, with voice place
  search listed beside /api/overpass among the keyless map routes.
- scripts/format-scope.json: both sides. A merge on main dropped 97 entries
  (being restored there); keeping them, this PR's 12 and main's 2 new ones
  keeps every file in format:check. All 1,222 paths exist.
- Translation catalogs: main's two new keys and this PR's 47, no overlap.
- Layer count 36 (33 + OSM Places + Sea Marks + Ski Pistes); both schema
  pins re-derived, the first-run length is exactly 30,919 + 292 + 107.

server/providers/overpass.js

@@ -1,6 +1,12 @@
-import { makeRateLimiter, clientKey } from './common/rate-limit.js';
+import {
+  makeRateLimiter,
+  clientKey,
+  clientNetworkKey,
+  isLoopbackPeer,
+} from './common/rate-limit.js';
+import { hasProxySignals } from '../../src/localRequestGate.mjs';
 import { readRequestBodyCapped } from './common/request.js';
-import { admitSameSite } from './common/same-site.js';
+import { admitSameSiteKeyless } from './common/same-site.js';
 import {
   OVERPASS_MAX_BODY_BYTES,
   OVERPASS_MAX_CONCURRENT,
@@ -30,10 +36,21 @@ const _overpassInFlight = new Map();
 let _overpassConcurrent = 0;
 
 // Bound body-reading and validation work, including malformed requests and
-// cache hits. Keep the tighter upstream budget below independent of this gate.
-const _overpassRequestLimiter = makeRateLimiter({
-  windowMs: 60_000,
-  max: 300,
+// cache hits, before a byte is read. Remote peers share one global window so
+// address rotation cannot mint admission without bound (IPv6 peers are keyed
+// by /64 for the same reason). A direct loopback request — the owner's own
+// browser and the repo QA harnesses, with no forwarding headers — has its own
+// per-peer window outside that global, so busy LAN peers cannot lock the owner
+// out of the map. A request relayed by a reverse proxy on this machine also
+// arrives from loopback, but it is remote traffic: it is admitted from the
+// remote pool under its own socket-keyed bucket, never from the owner's. The
+// forwarded client address is not trusted as identity. Only admission is
+// isolated: the upstream budget below (90/min per key, 300/min globally) is
+// shared, so an owner request that misses cache can still be refused there.
+const OVERPASS_ADMISSION_WINDOW = { windowMs: 60_000, max: 300 };
+const _overpassLoopbackAdmission = makeRateLimiter(OVERPASS_ADMISSION_WINDOW);
+const _overpassPeerAdmission = makeRateLimiter({
+  ...OVERPASS_ADMISSION_WINDOW,
   globalMax: 900,
 });
 
@@ -43,6 +60,33 @@ const _overpassRateLimiter = makeRateLimiter({
   globalMax: 300,
 });
 
+/**
+ * Classify a request for admission. Direct loopback — a loopback socket with
+ * no forwarding header — is the owner's own pool; everything else, including a
+ * loopback socket that carries forwarding headers (a local reverse proxy), is
+ * remote. A proxied request keeps its socket identity under a `proxied:`
+ * prefix, so it never shares a bucket with the owner's direct requests.
+ * @param {import('http').IncomingMessage} req
+ * @returns {{direct: boolean, key: string}}
+ */
+function overpassAdmissionClass(req) {
+  const peer = clientNetworkKey(req);
+  if (!isLoopbackPeer(clientKey(req))) return { direct: false, key: peer };
+  if (hasProxySignals(req.headers || {}))
+    return { direct: false, key: `proxied:${peer}` };
+  return { direct: true, key: peer };
+}
+
+/**
+ * Spend one admission slot for this request; false when its bucket is over its
+ * window (or, for remote traffic, when the shared global window is full).
+ * @param {{direct: boolean, key: string}} admission - `overpassAdmissionClass(req)`.
+ * @returns {boolean}
+ */
+function admitOverpassRequest({ direct, key }) {
+  return (direct ? _overpassLoopbackAdmission : _overpassPeerAdmission)(key);
+}
+
 /**
  * Write a completed Overpass payload to the HTTP response.
  *
@@ -104,8 +148,13 @@ function overpassProxy({ routing = {} } = {}) {
           return;
         }
 
-        if (admitSameSite(req, res)) return;
-        if (!_overpassRequestLimiter(clientKey(req))) {
+        // Keyless gate: refuses cross-site browser requests but, unlike the
+        // cost-bearing routes, admits the forwarding headers a reverse proxy
+        // adds — the layers that depend on Overpass must keep working for an
+        // instance deployed the way the README documents.
+        if (admitSameSiteKeyless(req, res)) return;
+        const admission = overpassAdmissionClass(req);
+        if (!admitOverpassRequest(admission)) {
           res.writeHead(429, {
             'Content-Type': 'application/json',
             'Cache-Control': 'no-store',
@@ -164,7 +213,7 @@ function overpassProxy({ routing = {} } = {}) {
           // requests; boundary-class queries keep their month-long TTL.
           readDisk: () =>
             readOverpassDisk(cacheKey, overpassDiskTtlMs(cacheKey)),
-          allowUpstream: () => _overpassRateLimiter(clientKey(req)),
+          allowUpstream: () => _overpassRateLimiter(admission.key),
           loadUpstream: async () => {
             if (_overpassConcurrent >= OVERPASS_MAX_CONCURRENT)
               return {