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>

ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -1,23 +1,23 @@
 {
   "images" : [
     {
-      "filename" : "LaunchImage.png",
       "idiom" : "universal",
+      "filename" : "LaunchImage.png",
       "scale" : "1x"
     },
     {
-      "filename" : "LaunchImage@2x.png",
       "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
       "scale" : "2x"
     },
     {
-      "filename" : "LaunchImage@3x.png",
       "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
       "scale" : "3x"
     }
   ],
   "info" : {
-    "author" : "xcode",
-    "version" : 1
+    "version" : 1,
+    "author" : "xcode"
   }
 }