feat: hwaccel + Fanart/TheTVDB + AI + Discover + NFO + Tasks + Recycle bin

Backend
  - service/transcoder.go: encoder selector (software / nvenc / qsv /
    vaapi) with proper hwaccel + scale_* filters per encoder; configurable
    bitrate/preset/height/segment-seconds via transcoder.* config; new
    Active() snapshot + ActiveJob struct for the Tasks panel; unit-tested
    via buildFFmpegArgs(...).
  - service/thetvdb.go: TheTVDB v4 provider — login() caches the JWT for
    24h, SearchSeries() returns Match struct.
  - service/fanart.go: Fanart.tv provider — high-res movie artwork keyed
    by TMDb id; used to upgrade poster/backdrop after a successful match.
  - service/scraper.go: provider chain reworked — anime → Bangumi, tv →
    TheTVDB, default → TMDb, with optional Fanart upgrade post-match.
  - service/discover.go: TMDb /trending/movie/day + /movie/popular for
    the Discover rail.
  - service/ai.go: OpenAI-compatible client. SmartSearch() turns a free-
    form query into a structured SearchIntent JSON; Recommend() emits a
    short list of titles given the user's history. Disabled when
    ai.api_key is empty.
  - service/nfo.go: per-movie .nfo writer (Kodi/Jellyfin schema) +
    library-scope batch exporter.
  - service/media.go: SoftDelete / Restore / Purge / ListRecycleBin
    helpers backed by gorm Unscoped().
  - service/service.go: container wires Fanart, TheTVDB, Discover, AI,
    NFO; everything still tears down cleanly via Close().
  - config: new transcoder.* section (encoder, preset, video_bitrate,
    max_rate, buf_size, max_height, segment_seconds) with sensible
    defaults.

Handlers / routes
  - new files: discover.go, recycle.go, nfo.go, ai.go, tasks.go.
  - registers GET /tasks, /discover/{trending,popular},
    /ai/{status,search,recommend}; admin-only GET /recycle and
    DELETE/POST /media/:id (soft delete / restore / purge); admin-only
    POST /media/:id/nfo and /libraries/:id/nfo.

Frontend
  - new pages: DiscoverPage, TasksPage, RecycleBinPage; SearchPage gains
    an optional AI smart-search toggle that calls /api/ai/search.
  - MediaDetailPage gains admin actions for 导出 NFO and 移至回收站.
  - new api/ helpers: ai.ts, discover.ts, recycle.ts, tasks.ts.
  - App.tsx routes /discover, /tasks, /recycle (last two admin-only).
  - Layout sidebar groups now include Discover + Tasks + Recycle Bin.

Docker / config
  - Dockerfile: adds intel-media-driver / libva-utils / mesa-va-gallium
    so QSV + VAAPI work out of the box on Intel iGPUs.
  - docker-compose.yml: documents devices + group_add + nvidia runtime
    overrides for hardware transcoding.

Verified: go build, go vet, go test (incl. new TestBuildFFmpegArgs across
software / nvenc / qsv / vaapi encoder profiles); tsc -b && vite build
emits 22 route chunks plus the deferred hls chunk; main bundle 248 KB /
83 KB gzipped.

web/src/pages/MediaDetailPage.tsx

@@ -1,10 +1,11 @@
 import { useEffect, useState } from 'react'
-import { Link, useParams } from 'react-router-dom'
-import { Heart, Play, RefreshCw, Sparkles } from 'lucide-react'
+import { Link, useNavigate, useParams } from 'react-router-dom'
+import { FileText, Heart, Play, RefreshCw, Sparkles, Trash2 } from 'lucide-react'
 import toast from 'react-hot-toast'
 
 import { mediaAPI } from '../api/library'
 import { playbackAPI } from '../api/playback'
+import { recycleAPI } from '../api/recycle'
 import { imageURL } from '../api/client'
 import { useAuthStore } from '../stores/auth'
 import { api } from '../api/client'
@@ -39,6 +40,7 @@ function fmtSize(bytes: number): string {
 //   - Re-probe     (admin only, refreshes ffprobe metadata)
 export function MediaDetailPage() {
   const { id = '' } = useParams()
+  const navigate = useNavigate()
   const role = useAuthStore((s) => s.user?.role)
   const [media, setMedia] = useState<Media | null>(null)
   const [favourite, setFavourite] = useState(false)
@@ -81,6 +83,27 @@ export function MediaDetailPage() {
     await refresh()
   }
 
+  const exportNFO = async () => {
+    if (!media) return
+    try {
+      const r = await recycleAPI.exportNFO(media.id)
+      toast.success(`NFO 已写入 ${r.path}`)
+    } catch (err: unknown) {
+      const msg =
+        (err as { response?: { data?: { error?: string } } })?.response?.data?.error ??
+        '导出失败'
+      toast.error(msg)
+    }
+  }
+
+  const softDelete = async () => {
+    if (!media) return
+    if (!confirm(`将「${media.title}」移至回收站? (磁盘文件保留)`)) return
+    await recycleAPI.softDelete(media.id)
+    toast.success('已移至回收站')
+    navigate(-1)
+  }
+
   if (loading) return <p className="text-slate-500">加载中…</p>
   if (!media) return <p className="text-slate-500">媒体不存在</p>
 
@@ -149,6 +172,15 @@ export function MediaDetailPage() {
                 <button onClick={reprobe} className="neon-button">
                   <RefreshCw size={16} /> 重新探测
                 </button>
+                <button onClick={exportNFO} className="neon-button">
+                  <FileText size={16} /> 导出 NFO
+                </button>
+                <button
+                  onClick={softDelete}
+                  className="neon-button !border-red-400/40 !bg-red-400/10 !text-red-400"
+                >
+                  <Trash2 size={16} /> 移至回收站
+                </button>
               </>
             )}
           </div>