feat(organize): organize arbitrary source dir (e.g. downloads) with dedup + 洗版

- Add OrganizeDirectory service: walk an arbitrary source directory (download
  dir / NAS direct-read path) and organize video files into the destination,
  without requiring the source to be a registered library.
- Dedup: skip media already present in the destination (matched by scanned DB
  identity title+year[/season+episode], robust to dir case/layout, plus a
  filesystem folder fallback).
- 洗版 (resolution replacement): when the source resolution is higher than the
  existing version, replace the lower-res file (+NFO sidecar +DB row). Prefers
  scanned dimensions, then ffprobe, then filename token; never replaces on
  unknown resolution.
- New endpoints: GET /admin/organize/sources (download/media dir candidates)
  and POST /admin/organize/source.
- UI: ToolsPage adds a '整理来源目录（去重+洗版）' form so operators can pick the
  download dir as the organize source.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

web/src/api/tools.ts

@@ -12,6 +12,15 @@ export interface OrganizeOverrides {
   transfer_mode?: string
 }
 
+// OrganizeSource is a selectable organize source directory (e.g. the download
+// directory) surfaced so operators can organize an arbitrary directory and not
+// only registered libraries.
+export interface OrganizeSource {
+  label: string
+  path: string
+  kind: string
+}
+
 export const toolsAPI = {
   organizeMedia: (mediaID: string, opts?: OrganizeOverrides) =>
     api
@@ -26,6 +35,22 @@ export const toolsAPI = {
       )
       .then((r) => r.data),
 
+  // organizeSources lists selectable source directories (download/media dir).
+  organizeSources: () =>
+    api
+      .get<{ sources: OrganizeSource[] }>('/admin/organize/sources')
+      .then((r) => r.data.sources ?? []),
+
+  // organizeDirectory organizes an arbitrary source directory (e.g. downloads)
+  // into the destination with dedup + 洗版 (resolution replacement).
+  organizeDirectory: (opts: OrganizeOverrides) =>
+    api
+      .post<{ organized: number; skipped: number; replaced?: number; errors?: string[] }>(
+        '/admin/organize/source',
+        opts,
+      )
+      .then((r) => r.data),
+
   notifyTest: (title: string, body: string) =>
     api
       .post<{ message: string }>('/admin/notify/test', { title, body })