sync: capture the production server's code, which was never committed

/root/Routes-api on 31.97.228.132 is not a git repository. Work had been
done directly on the box and existed nowhere else -- a single rm -rf from
being lost, and impossible to review or roll back.

Deploying the previous HEAD over it would have silently reverted all of
this. Most visibly the Valhalla road-backend probe in main.py, whose own
comment explains why it exists: road sequencing degrades to aerial
silently by design, so an unreachable backend stays invisible, "which is
exactly how the expired Google key went unnoticed". Overwriting it would
have reintroduced precisely the failure it was written to catch, and the
service would have kept answering 200 throughout.

The server had also moved from Google Maps to Valhalla for road distance
(VALHALLA_URL, road_backend_status, +190 lines in route_optimizer),
extended docker-compose from 44 to 95 lines, and changed rider fetching,
health, dynamic config and the cache layer.

Only 10 files differ in substance. The other 27 that appeared to differ
were CRLF-vs-LF noise -- the server writes CRLF -- and are normalised to
LF here rather than committed as spurious whole-file rewrites.

Committed as-is, before any change of mine, so the diff that follows is
reviewable against what is actually running.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/routes/__init__.py

@@ -6,7 +6,6 @@ from .cache import router as cache_router
 from .ml_admin import router as ml_router, web_router as ml_web_router
 from .batch_analytics import router as batch_analytics_router
 from .riders import router as riders_router
-from .doormile import router as doormile_router
 
 __all__ = [
     "optimization_router",
@@ -16,5 +15,4 @@ __all__ = [
     "ml_web_router",
     "batch_analytics_router",
     "riders_router",
-    "doormile_router",
 ]

app/routes/health.py

@@ -84,6 +84,26 @@ async def readiness_check(request: Request):
         }
 
 
+@router.get("/road-backend")
+async def road_backend_check(request: Request):
+    """
+    Status of the Valhalla road-matrix backend used for road-aware stop sequencing.
+
+    Deliberately separate from /ready: an unreachable backend is a degradation,
+    not an outage — routing falls back to aerial ordering and keeps serving. This
+    endpoint is how you notice the degradation.
+    """
+    from app.services.routing.route_optimizer import road_backend_status
+
+    status = await road_backend_status()
+    return {
+        **status,
+        "sequencing_mode": "road" if status.get("reachable") else "aerial",
+        "timestamp": datetime.utcnow().isoformat() + "Z",
+        "request_id": getattr(request.state, "request_id", None),
+    }
+
+
 @router.get("/live")
 async def liveness_check(request: Request):
     """