Replace the customer app with Doormile CX

Book a pickup, track it to delivery — the rebuilt customer app.

- Design language from doormile-screens.html: brand #8F0F06, Manrope +
  Geist Mono (variable fonts), bordered cards instead of shadows, crimson
  brand headers, sliding tab indicator, mono for anything read digit by digit.
- lib/data (one live API implementation, plus a debug-only offline fake),
  lib/state, lib/ui (tokens, widgets, screens).
- 84 tests, plus a design snapshot harness that renders every screen with the
  real fonts: flutter test test/design_snapshot_test.dart --run-skipped
  --update-goldens

This replaces the previous app (pubspec 'doormile', app id
com.doormile.customer). That tree remains in history at 6c7d656; note its
android/app/google-services.json is not carried over, and the application id
here is in.doormile.customer.

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

.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "924134a44c189315be2148659913dda1671cbe99"
+  revision: "d3b14c876900e553bc736ca19295fc09e3853e8e"
   channel: "stable"
 
 project_type: app
@@ -13,20 +13,17 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: 924134a44c189315be2148659913dda1671cbe99
-      base_revision: 924134a44c189315be2148659913dda1671cbe99
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
     - platform: android
-      create_revision: 924134a44c189315be2148659913dda1671cbe99
-      base_revision: 924134a44c189315be2148659913dda1671cbe99
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
     - platform: ios
-      create_revision: 924134a44c189315be2148659913dda1671cbe99
-      base_revision: 924134a44c189315be2148659913dda1671cbe99
-    - platform: macos
-      create_revision: 924134a44c189315be2148659913dda1671cbe99
-      base_revision: 924134a44c189315be2148659913dda1671cbe99
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
     - platform: web
-      create_revision: 924134a44c189315be2148659913dda1671cbe99
-      base_revision: 924134a44c189315be2148659913dda1671cbe99
+      create_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
+      base_revision: d3b14c876900e553bc736ca19295fc09e3853e8e
 
   # User provided section