fix: align AI retouch template rules

suixinkan/Features/TravelAlbum/Models/TravelAlbumModels.swift

@@ -387,14 +387,13 @@ enum TravelAlbumAIRetouchWorkflow: Sendable, Equatable {
         }
     }
 
-    /// 当前分组是否允许不选择；首次修图和原图 Tab 覆盖重修的氛围感模板选填。
+    /// 当前分组是否允许不选择；首次修图仅氛围感选填，已有 AI 结果的预览重修两类模板均选填。
     func isOptional(_ category: TravelAlbumAIRetouchTemplateCategory) -> Bool {
-        guard category == .atmosphere else { return false }
         switch self {
         case .initial:
-            return true
+            return category == .atmosphere
         case .reretouch(_, _, .all):
-            return true
+            return category == .refined || category == .atmosphere
         case .reretouch:
             return false
         }

suixinkan/Features/TravelAlbum/Models/TravelAlbumPreviewModels.swift

@@ -175,7 +175,7 @@ struct TravelAlbumPreviewProject: Identifiable, Sendable, Hashable {
         self.assets = assets.filter { seenKinds.insert($0.kind).inserted }
     }
 
-    /// 根据当前 Tab 生成首次修图或覆盖重修工作流。
+    /// 根据是否已有 AI 结果生成首次修图或双模板覆盖重修工作流。
     func aiRetouchWorkflow(
         albumId: Int,
         selectedKind: TravelAlbumPreviewAssetKind
@@ -183,16 +183,8 @@ struct TravelAlbumPreviewProject: Identifiable, Sendable, Hashable {
         guard hasVariants else {
             return .initial(albumId: albumId, materialIds: [originalMaterialId])
         }
-        switch selectedKind {
-        case .original:
-            return .reretouch(materialId: originalMaterialId, batchId: aiRetouchBatchId, type: .all)
-        case .retouched:
-            return .reretouch(materialId: originalMaterialId, batchId: aiRetouchBatchId, type: .refined)
-        case .atmosphere:
-            return .reretouch(materialId: originalMaterialId, batchId: aiRetouchBatchId, type: .atmosphere)
-        case .cover:
-            return nil
-        }
+        guard selectedKind != .cover else { return nil }
+        return .reretouch(materialId: originalMaterialId, batchId: aiRetouchBatchId, type: .all)
     }
 }