chore(branding): Anzeigename 'Holzleitner Auslieferung' + Launcher-Icon

- Android android:label, iOS CFBundleDisplayName, MaterialApp.title -> 'Holzleitner Auslieferung'
- flutter_launcher_icons (assets/launch_icon.png) als Dev-Dep + Config

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pubspec.lock

@@ -177,6 +177,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
+  cli_util:
+    dependency: transitive
+    description:
+      name: cli_util
+      sha256: ff6785f7e9e3c38ac98b2fb035701789de90154024a75b6cb926445e83197d1c
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.2"
   clock:
     dependency: transitive
     description:
@@ -374,6 +382,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "9.1.1"
+  flutter_launcher_icons:
+    dependency: "direct dev"
+    description:
+      name: flutter_launcher_icons
+      sha256: "10f13781741a2e3972126fae08393d3c4e01fa4cd7473326b94b72cf594195e7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.14.4"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -599,6 +615,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      sha256: f9881ff4998044947ec38d098bc7c8316ae1186fa786eddffdb867b9bc94dfce
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.8.0"
   image_picker:
     dependency: "direct main"
     description: