feat: 完善相册 AI 修图模板选择流程

suixinkan/Features/TravelAlbum/Models/TravelAlbumModels.swift

@@ -428,22 +428,35 @@ struct TravelAlbumAIRetouchTemplatesResponse: Decodable, Sendable, Equatable {
     let refinedTemplates: [TravelAlbumAIRetouchTemplate]
     let atmosphereTemplates: [TravelAlbumAIRetouchTemplate]
     let coverTemplates: [TravelAlbumAIRetouchTemplate]
+    let remainingQuota: Int
 
     enum CodingKeys: String, CodingKey {
         case refinedTemplates = "refined_templates"
         case atmosphereTemplates = "atmosphere_templates"
         case coverTemplates = "cover_templates"
+        case remainingQuota = "remaining_quota"
     }
 
     /// 创建分组模板响应，默认各组为空。
     init(
         refinedTemplates: [TravelAlbumAIRetouchTemplate] = [],
         atmosphereTemplates: [TravelAlbumAIRetouchTemplate] = [],
-        coverTemplates: [TravelAlbumAIRetouchTemplate] = []
+        coverTemplates: [TravelAlbumAIRetouchTemplate] = [],
+        remainingQuota: Int = 0
     ) {
         self.refinedTemplates = refinedTemplates
         self.atmosphereTemplates = atmosphereTemplates
         self.coverTemplates = coverTemplates
+        self.remainingQuota = max(0, remainingQuota)
+    }
+
+    /// 解码模板和剩余额度；旧响应缺少额度时按零处理，避免误提交付费任务。
+    init(from decoder: any Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        refinedTemplates = try container.decode([TravelAlbumAIRetouchTemplate].self, forKey: .refinedTemplates)
+        atmosphereTemplates = try container.decode([TravelAlbumAIRetouchTemplate].self, forKey: .atmosphereTemplates)
+        coverTemplates = try container.decode([TravelAlbumAIRetouchTemplate].self, forKey: .coverTemplates)
+        remainingQuota = max(0, try container.decodeIfPresent(Int.self, forKey: .remainingQuota) ?? 0)
     }
 }