feat: skip existing media in STRM tree generation

web/src/pages/StrmTreeGenerateSection.tsx

@@ -32,6 +32,7 @@ export function StrmTreeGenerateSection({
   batchLimit,
   cleanup,
   generating,
+  missingOnly,
   onGenerate,
   onPreview,
   onImportTreeFile,
@@ -46,6 +47,7 @@ export function StrmTreeGenerateSection({
   setBaseURL,
   setBatchLimit,
   setCleanup,
+  setMissingOnly,
   setOutputDir,
   setOutputPrefix,
   setOverwrite,
@@ -187,6 +189,10 @@ export function StrmTreeGenerateSection({
           <input type="checkbox" checked={transferSubtitles} onChange={(e) => setTransferSubtitles(e.target.checked)} />
           转移同名字幕链接
         </label>
+        <label className="flex min-h-10 items-center gap-2 rounded-2xl border border-gray-200 bg-white/70 px-3 py-2 text-sm text-ink-50 md:col-span-4">
+          <input type="checkbox" checked={missingOnly} onChange={(e) => setMissingOnly(e.target.checked)} />
+          仅生成媒体库缺失
+        </label>
         <label className="flex min-h-10 items-center gap-2 rounded-2xl border border-gray-200 bg-white/70 px-3 py-2 text-sm text-ink-50 md:col-span-4">
           <input type="checkbox" checked={refreshLibrary} onChange={(e) => setRefreshLibrary(e.target.checked)} />
           生成后刷新媒体库