feat(GRO-2152): route optimization schema migration

Add the database foundation for mobile groomer route optimization:

- clients: latitude/longitude (double precision) + geocodedAt
- groomer_routes: per-(staff, date) route with route_status enum,
  totals, optimizedAt; UNIQUE(staff_id, route_date)
- route_stops: ordered stops FK->groomer_routes (cascade) + appointments,
  lat/lng, per-leg travel mins/distance, bufferMins;
  UNIQUE(route_id, appointment_id) and UNIQUE(route_id, stop_order)
- business_settings: defaultTravelBufferMins (default 15),
  routeOptimizationProvider (default nominatim), googleMapsApiKey
  (encrypted at rest at the app layer)
- Idempotent hand-authored migration 0041 + journal entry (when=max+1)

Lands in packages/db (the deployed schema/migration source per the
Dockerfile migrate stage); apps/api is the legacy CI-only copy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/db/migrations/meta/_journal.json

@@ -281,6 +281,13 @@
       "when": 1780000000002,
       "tag": "0040_register_missing_coat_type_values",
       "breakpoints": true
+    },
+    {
+      "idx": 41,
+      "version": "7",
+      "when": 1780000000003,
+      "tag": "0041_route_optimization",
+      "breakpoints": true
     }
   ]
-}
+}