refactor(config): 服务地址改为 dev/prod 配置文件与单个环境开关

启动时按环回、局域网、公网顺序探测地址，换网络后会静默切到别处，排查
困难。改为代码内一个布尔开关选择环境，地址分别放在 dev_config.dart 与
prod_config.dart，不再探测；调试条改地址后直接重载，不再重新探测。
release 构建若仍是开发开关会启动即报错，避免线上包连开发机。

lib/pages/discover/discover_view.dart

@@ -10,7 +10,6 @@ import 'package:provider/provider.dart';
 import '../../core/data/models/drama.dart';
 import '../../core/data/repositories/catalog_repository.dart';
 import '../../core/data/repositories/search_repository.dart';
-import '../../core/data/services/catalog_retry.dart';
 import '../../core/data/services/category_controller.dart';
 import '../../core/data/services/theater_feed_controller.dart';
 import '../../core/formatting/error_text.dart';
@@ -408,15 +407,11 @@ class _DiscoverPageState extends State<DiscoverPage> {
   );
 
   Future<void> _retryCategories(CategoryController categories) {
-    return retryCatalogLoad(reload: categories.load);
+    return categories.load();
   }
 
-  Future<void> _retryTheater() async {
-    await retryCatalogLoad(
-      reload: () async {
-        await theater.refreshCurrent();
-      },
-    );
+  Future<void> _retryTheater() {
+    return theater.refreshCurrent();
   }
 
   Future<void> _editTheaterEndpoint() {

lib/pages/home/home_view.dart

@@ -6,7 +6,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
-import '../../core/config/app_config.dart';
 import '../../core/data/remote/catalog_api.dart';
 import '../../core/data/services/home_feed_controller.dart';
 import '../../core/data/services/catalog_controller.dart';
@@ -67,7 +66,7 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
   ) async {
     _resumeRetryInFlight = true;
     try {
-      await AppConfig.probeAndApplyBaseUrl();
+      // 地址是构建期常量，回前台只需要重试失败的数据请求。
       await Future.wait([
         if (catalog.error != null) catalog.load(),
         if (categories.error != null) categories.load(),
@@ -80,10 +79,7 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
   @override
   Widget build(BuildContext context) {
     final catalog = context.watch<CatalogController>();
-    return Theme(
-      data: AppTheme.dark(),
-      child: _buildHome(context, catalog),
-    );
+    return Theme(data: AppTheme.dark(), child: _buildHome(context, catalog));
   }
 
   Widget _buildHome(BuildContext context, CatalogController catalog) {