feat(app): launcher icon — brand logo 1024px + adaptive (blue #1A73E8 background)

flutter_launcher_icons 自动生成全尺寸 mipmap（48-192px + 自适应前景/背景）。
正式签名生产环境 APK 已打好。

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

apps/mobile/pubspec.lock

@@ -17,6 +17,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "13.0.0"
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      sha256: "6c5bcd986e06b94e3c40244af471750840a3d2341d1f9763a1100a14add517b4"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.3.0"
   args:
     dependency: transitive
     description:
@@ -157,10 +165,10 @@ packages:
     dependency: transitive
     description:
       name: cli_util
-      sha256: "71e43f1976c3eae2d9468a5b4d6600bf8cae61508b87f27fa1799228935d48ab"
+      sha256: ff6785f7e9e3c38ac98b2fb035701789de90154024a75b6cb926445e83197d1c
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.5.2"
+    version: "0.4.2"
   clock:
     dependency: transitive
     description:
@@ -331,6 +339,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_launcher_icons:
+    dependency: "direct dev"
+    description:
+      name: flutter_launcher_icons
+      sha256: "10f13781741a2e3972126fae08393d3c4e01fa4cd7473326b94b72cf594195e7"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.14.4"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -487,6 +503,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "4.1.2"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      sha256: a1e7f4951e538a568e14b856702afc9ae1d2f4b202daced8d22c1b9cd211ce89
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "4.10.1"
   image_picker:
     dependency: "direct main"
     description:
@@ -788,6 +812,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.5.3"
+  posix:
+    dependency: transitive
+    description:
+      name: posix
+      sha256: bc1bad54ad2b735816e31f8d4600cfde6c7839975085ddfbca48b6c9f7c4044e
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "6.5.2"
   process:
     dependency: transitive
     description: