feat: 添加环境枚举和配置，优化 H5 线路生成逻辑

lib/config/app_config.dart

@@ -12,6 +12,12 @@ class H5Line {
   Uri get uri => Uri.parse(url);
 }
 
+enum Environment {
+  development,
+  staging,
+  production,
+}
+
 class AppConfig {
   static const String appName = '本地打包';
   static const String appLogo = '';
@@ -23,6 +29,16 @@ class AppConfig {
     '*.zdyswvnt.vip',
     '*.gxifpxcr.vip',
   ];
+  static const Environment currentEnvironment = Environment.production;
+
+  // Kept for the packaging service's legacy domain rewrite step.
+  static final Map<Environment, List<String>> _environmentHosts = {
+    Environment.production: [
+      '*.albzyuxq.vip',
+      '*.zdyswvnt.vip',
+      '*.gxifpxcr.vip',
+    ],
+  };
 
   static final Random _random = Random.secure();
 
@@ -32,8 +48,8 @@ class AppConfig {
     int attempt = 0,
     String Function()? wildcardFactory,
   }) {
-    final template = wildcardH5DomainTemplates[
-        attempt.abs() % wildcardH5DomainTemplates.length];
+    final templates = _h5DomainTemplatesForCurrentEnvironment;
+    final template = templates[attempt.abs() % templates.length];
     return h5LineFromUrl(
       _buildFlutterShellHomeUrl(
         _replaceWildcardHost(template, wildcardFactory: wildcardFactory),
@@ -41,6 +57,14 @@ class AppConfig {
     );
   }
 
+  static List<String> get _h5DomainTemplatesForCurrentEnvironment {
+    final environmentHosts = _environmentHosts[currentEnvironment];
+    if (environmentHosts == null || environmentHosts.isEmpty) {
+      return wildcardH5DomainTemplates;
+    }
+    return environmentHosts;
+  }
+
   static H5Line h5LineFromUrl(String value) {
     return H5Line(label: '线路1', url: _normalizeHomeUrl(value));
   }