refactor(client): license_copy 内联色 + 删除 app_theme.dart（AppTheme 退役）

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

client/lib/core/config/license_copy.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 
 import '../../models/license.dart';
-import '../theme/app_theme.dart';
 
 /// 授权阶段文案 + 阈值的集中配置。
 ///
@@ -114,7 +113,7 @@ class LicenseCopy {
   static Color bannerColor(String phase) {
     switch (phase) {
       case 'locked':
-        return AppTheme.danger;
+        return const Color(0xFFD14343);
       case 'readonly':
         return const Color(0xFFB71C1C); // 深红，强调即将彻底锁定
       case 'grace':
@@ -128,12 +127,12 @@ class LicenseCopy {
   static Color phaseColor(String phase) {
     switch (phase) {
       case 'grace':
-        return AppTheme.warning500;
+        return const Color(0xFFE08E00);
       case 'readonly':
       case 'locked':
-        return AppTheme.danger;
+        return const Color(0xFFD14343);
       default:
-        return AppTheme.success;
+        return const Color(0xFF2E8B57);
     }
   }