feat: M1.1 完成 + M1.2 启动 — 全量更新

M1.1 收尾:
- 24项 P0/P1/P2 bug 修复 (Rust 107 tests + Flutter 15 tests)
- Flutter App v0.3: cupertino_icons 修复, 单元测试, 调试面板, APK 52.6MB
- 示例插件完善: manifest.json + 请求/响应示范 + 7个测试
- API 文档重写 (以 routes.rs 为唯一权威)
- MILESTONES.md 更新至 100%

M1.2 启动:
- P0: 插件管理 API 闭环 (handle_manager_message Custom 分支 + broadcast_plugin_states)
- ServiceManager 集成测试 8/8 (tests/m1_2_service_manager.rs)
- M1.2 测试计划 (docs/M1.2_TEST_PLAN.md, 18个E2E场景)
- 动态插件系统: auto_rollback + version_manager GC + 路径穿越防护

总计: Rust 115/115 测试, Flutter 15/15 测试, 零 warning

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

clients/flutter/lib/services/http_api_service.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
@@ -11,9 +12,11 @@ import '../models/video_item.dart';
 import '../models/wifi_network.dart';
 import '../models/wifi_status.dart';
 
+typedef UploadProgressCallback = void Function(double progress);
+
 class HttpApiService {
   HttpApiService({required String baseUrl, http.Client? client})
-      : _baseUrl = _normalizeBaseUrl(baseUrl),
+      : _baseUrl = normalizeBaseUrl(baseUrl),
         _client = client ?? http.Client();
 
   final http.Client _client;
@@ -22,7 +25,7 @@ class HttpApiService {
   String get baseUrl => _baseUrl;
 
   set baseUrl(String value) {
-    _baseUrl = _normalizeBaseUrl(value);
+    _baseUrl = normalizeBaseUrl(value);
   }
 
   Uri _uri(String path, [Map<String, String>? queryParameters]) {
@@ -229,6 +232,17 @@ class HttpApiService {
     return _uploadSingleFile('/api/videos/upload', file);
   }
 
+  Future<ApiResponse> uploadVideoWithProgress(
+    File file, {
+    UploadProgressCallback? onProgress,
+  }) {
+    return _uploadSingleFile(
+      '/api/videos/upload',
+      file,
+      onProgress: onProgress,
+    );
+  }
+
   Future<ApiResponse> uploadVideos(List<String> filePaths) async {
     if (filePaths.isEmpty) {
       throw const ApiException('未选择上传文件');
@@ -377,17 +391,63 @@ class HttpApiService {
     String endpoint,
     File file, {
     String? directoryPath,
+    UploadProgressCallback? onProgress,
   }) async {
     final request = http.MultipartRequest(
       'POST',
       _uri(endpoint, _pathQuery(directoryPath)),
     );
-    request.files.add(await http.MultipartFile.fromPath('file', file.path));
+    request.files.add(
+      await _createMultipartFile(
+        file,
+        fieldName: 'file',
+        onProgress: onProgress,
+      ),
+    );
     final response = await http.Response.fromStream(await request.send());
+    onProgress?.call(1);
     _ensureSuccess(response);
     return ApiResponse.fromJson(_decodeMap(response.body));
   }
 
+  Future<http.MultipartFile> _createMultipartFile(
+    File file, {
+    required String fieldName,
+    UploadProgressCallback? onProgress,
+  }) async {
+    final length = await file.length();
+    final filename = file.uri.pathSegments.isNotEmpty
+        ? file.uri.pathSegments.last
+        : file.path;
+
+    if (onProgress == null) {
+      return http.MultipartFile.fromPath(fieldName, file.path, filename: filename);
+    }
+
+    var uploaded = 0;
+    final stream = http.ByteStream(
+      file.openRead().transform(
+        StreamTransformer<List<int>, List<int>>.fromHandlers(
+          handleData: (chunk, sink) {
+            uploaded += chunk.length;
+            if (length > 0) {
+              final progress = (uploaded / length).clamp(0.0, 1.0);
+              onProgress(progress);
+            }
+            sink.add(chunk);
+          },
+        ),
+      ),
+    );
+
+    return http.MultipartFile(
+      fieldName,
+      stream,
+      length,
+      filename: filename,
+    );
+  }
+
   Future<ApiResponse> _postCommand(String path) async {
     final response = await _client.post(_uri(path));
     _ensureSuccess(response);
@@ -477,7 +537,7 @@ class HttpApiService {
     _client.close();
   }
 
-  static String _normalizeBaseUrl(String raw) {
+  static String normalizeBaseUrl(String raw) {
     final trimmed = raw.trim();
     if (trimmed.isEmpty) {
       throw const ApiException('baseUrl 不能为空');