feat: 匹配素材改为针对单个镜头匹配

- 新增 matchSingleMaterial 函数，调用单条匹配 API
- 点击'匹配素材'只匹配当前镜头，不影响其他镜头

tauri-app/src/pages/VideoGeneration/hooks/useEmptyShotMaterials.ts

@@ -10,6 +10,7 @@ export interface UseEmptyShotMaterialsResult {
   materialMatchMap: Record<string, { url: string; duration: number } | null>;
   userUploadedMaterials: Record<string, { path: string; duration: number }>;
   matchMaterials: () => Promise<void>;
+  matchSingleMaterial: (shotId: string) => Promise<void>;
   switchMaterial: (shotId: string) => Promise<{ url: string; duration: number } | null>;
   uploadMaterial: (shotId: string) => Promise<{ path: string; duration: number } | null>;
   setMaterialMatchMap: React.Dispatch<
@@ -93,6 +94,35 @@ export function useEmptyShotMaterials(
     // 匹配结果仅作为组件本地状态，视频生成成功后再统一持久化到 segments.json
   };
 
+  /**
+   * 单个镜头素材匹配
+   */
+  const matchSingleMaterial = async (shotId: string) => {
+    const shot = shots.find((s) => String(s.id) === shotId);
+    if (!shot || shot.type !== 'empty_shot' || !shot.scene) {
+      return;
+    }
+
+    const assignedMap = computeAssignedIntervals(shots);
+    const assigned = assignedMap[shot.id];
+    const requiredDuration = (assigned.assignedEnd - assigned.assignedStart) / 1000;
+
+    try {
+      const result = await matchMaterial(shot.scene || '', requiredDuration, projectId || undefined);
+      setMaterialMatchMap((prev) => ({
+        ...prev,
+        [shotId]: result || null,
+      }));
+      if (!result) {
+        toast.warning('暂无可用素材');
+      }
+    } catch (err) {
+      console.error('[VideoGeneration] 素材匹配失败:', err);
+      toast.error(err instanceof Error ? err.message : '素材匹配失败');
+      setMaterialMatchMap((prev) => ({ ...prev, [shotId]: null }));
+    }
+  };
+
   /**
    * 切换空镜素材（换一个）
    * 返回新素材信息，由调用方决定是否刷新预览
@@ -187,6 +217,7 @@ export function useEmptyShotMaterials(
     materialMatchMap,
     userUploadedMaterials,
     matchMaterials,
+    matchSingleMaterial,
     switchMaterial,
     uploadMaterial,
     setMaterialMatchMap,

tauri-app/src/pages/VideoGeneration/index.tsx

@@ -143,7 +143,7 @@ export default function VideoGeneration() {
   const {
     materialMatchMap,
     userUploadedMaterials,
-    matchMaterials,
+    matchSingleMaterial,
     switchMaterial,
     uploadMaterial,
     setMaterialMatchMap,
@@ -320,9 +320,9 @@ export default function VideoGeneration() {
     await uploadMaterial(shotId);
   };
 
-  // 处理素材匹配（手动触发批量匹配）
-  const handleMatchMaterial = async (_shotId: string) => {
-    await matchMaterials();
+  // 处理素材匹配（单个镜头触发匹配）
+  const handleMatchMaterial = async (shotId: string) => {
+    await matchSingleMaterial(shotId);
   };
 
   const activeShot = shots.find((s) => Number(s.id) === activeScene);