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/RecycleBinPage.tsx

@@ -0,0 +1,80 @@
+import { useEffect, useState } from 'react'
+import toast from 'react-hot-toast'
+import { RotateCcw, Trash2 } from 'lucide-react'
+
+import { recycleAPI } from '../api/recycle'
+import type { Media } from '../types'
+
+export function RecycleBinPage() {
+  const [items, setItems] = useState<Media[]>([])
+  const [loading, setLoading] = useState(true)
+
+  const refresh = () =>
+    recycleAPI
+      .list()
+      .then(setItems)
+      .finally(() => setLoading(false))
+
+  useEffect(() => {
+    refresh().catch(() => undefined)
+  }, [])
+
+  return (
+    <div className="space-y-6">
+      <h1 className="font-display text-3xl font-bold text-white">回收站</h1>
+      <p className="text-sm text-slate-400">
+        软删除的媒体保留在数据库中,可以恢复。彻底删除不会移除磁盘上的文件,只会从数据库清除条目。
+      </p>
+
+      {loading && <p className="text-slate-500">加载中…</p>}
+      {!loading && items.length === 0 && <p className="text-slate-400">回收站为空。</p>}
+
+      {items.length > 0 && (
+        <div className="glass-panel">
+          <table className="w-full text-left text-sm">
+            <thead className="text-xs uppercase tracking-wider text-slate-500">
+              <tr>
+                <th className="py-2">标题</th>
+                <th>路径</th>
+                <th className="text-right">操作</th>
+              </tr>
+            </thead>
+            <tbody>
+              {items.map((m) => (
+                <tr key={m.id} className="border-t border-white/5">
+                  <td className="py-2 text-white">{m.title}</td>
+                  <td className="max-w-md truncate text-slate-400" title={m.path}>
+                    {m.path}
+                  </td>
+                  <td className="space-x-2 py-2 text-right">
+                    <button
+                      className="rounded border border-primary-400/40 px-2 py-1 text-xs text-primary-400 hover:bg-primary-400/10"
+                      onClick={async () => {
+                        await recycleAPI.restore(m.id)
+                        toast.success('已恢复')
+                        await refresh()
+                      }}
+                    >
+                      <RotateCcw size={12} />
+                    </button>
+                    <button
+                      className="rounded border border-red-400/40 px-2 py-1 text-xs text-red-400 hover:bg-red-400/10"
+                      onClick={async () => {
+                        if (!confirm(`彻底删除「${m.title}」? (磁盘文件保留)`)) return
+                        await recycleAPI.purge(m.id)
+                        toast.success('已彻底删除')
+                        await refresh()
+                      }}
+                    >
+                      <Trash2 size={12} />
+                    </button>
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      )}
+    </div>
+  )
+}