feat: make the debug map link configurable per routing profile

[DennisOSRM]

Problem

The "Open in Debug Map" tool button always opens the bundled debug map at debug/. That page has a single hardcoded vector tile source (router.project-osrm.org/tile/v1/car/…), so it can only ever match one profile. A deployment configured with car/bike/foot modes has no way to send each mode to its own debug view.

Change

Routing modes accept an optional debugUrl:

[
  {"name":"car","url":"http://localhost:5000","debugUrl":"debug-car/"},
  {"name":"bike","url":"http://localhost:5001","debugUrl":"https://debug.example.com/bike/"}
]

• src/leaflet_options.js — parseModes() preserves debugUrl from the mode config (alongside path); buildServices() carries it onto the service descriptor.
• src/tools.js — debugUrl becomes a control option (default "debug/") with a setDebugUrl() setter. _openDebug() reads it and falls back to the bundled map if the URL is unparseable.
• src/index.js — new applyDebugUrlForProfile(), called at startup and from both places a profile switch lands: the mode-selector change handler and the back/forward history restore. Without the second call the button goes stale after a browser back.

Relative URLs resolve against the frontend origin (debug-car/ under /osrm-frontend/ becomes /osrm-frontend/debug-car/), absolute URLs are used as-is, and the #zoom/lat/lng hash is appended either way. A mode without debugUrl keeps opening the bundled debug/, so existing deployments are unchanged.

Works the same for non-Docker deployments, where modes are set in the inline window.osrmConfig block in index.html.

Tests

Three cases in test/tools.test.js (absolute URL, relative URL under a subpath, fallback when a mode has no debug URL) and one in test/leaflet_options.test.js (debugUrl surfaces on the service, absent when unset). Full suite: 273 passed. Lint clean.

bundle.js / dist/ are not rebuilt here — npm run build also runs scripts/replace.js, which rewrites sources in place.

Follow-ups, not in this PR

• The bundled debug/index.html could take its tile source from a query param, which would let one deployed debug map serve every profile.
• buildServices() reads mode.label / mode.labelKey, but parseModes() drops those fields, so they can never arrive and labels always fall back to name. Pre-existing and unrelated.

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