水印优化+ORC优化

lib/api/photo_api.dart

@@ -1,8 +1,11 @@
 import 'package:dio/dio.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
 
+import '../core/network/api_env.dart';
 import '../core/network/api_exception.dart';
 import '../core/network/dio_client.dart';
+import '../models/photo.dart';
 
 final photoApiProvider = Provider<PhotoApi>((ref) => PhotoApi(ref.watch(dioProvider)));
 
@@ -59,6 +62,51 @@ class PhotoApi {
     }
   }
 
+  /// 分页列表，最新的在前
+  Future<PhotoPage> list({int page = 1, int size = 30}) async {
+    try {
+      final res = await _dio.get<dynamic>(
+        '/photos',
+        queryParameters: {'page': page, 'size': size},
+      );
+      final data = res.data;
+      if (data is Map<String, dynamic>) return PhotoPage.fromJson(data);
+      if (data is Map) return PhotoPage.fromJson(Map<String, dynamic>.from(data));
+      return PhotoPage.empty;
+    } on DioException catch (e) {
+      final err = e.error;
+      throw err is ApiException ? err : ApiException(-1, '照片列表加载失败');
+    }
+  }
+
+  /// 把原图下载到临时文件，返回本地路径。
+  ///
+  /// 「重新打水印」必须先有本地文件：编辑页要读它拿尺寸、显示预览、合成成品。
+  /// 原图可能好几 MB，所以留了进度回调让界面能显示进度。
+  ///
+  /// [url] 是后端给的相对地址（`/uploads/...`），这里用 [resolveAssetUrl]
+  /// 补成绝对地址 —— `/uploads` 不在 `/api` 前缀下，不能直接丢给 dio。
+  Future<String> downloadOriginal(
+    String url, {
+    void Function(int received, int total)? onProgress,
+  }) async {
+    try {
+      final dir = await getTemporaryDirectory();
+      final path = '${dir.path}/photo_${DateTime.now().millisecondsSinceEpoch}.jpg';
+      await _dio.download(
+        resolveAssetUrl(url),
+        path,
+        onReceiveProgress: onProgress,
+        // 原图几 MB，移动网络下给宽一点
+        options: Options(receiveTimeout: const Duration(seconds: 120)),
+      );
+      return path;
+    } on DioException catch (e) {
+      final err = e.error;
+      throw err is ApiException ? err : ApiException(-1, '原图下载失败');
+    }
+  }
+
   /// 从路径里取个带扩展名的文件名，后端靠它判断文件类型
   static String _fileName(String path) {
     final normalized = path.replaceAll('\\', '/');