feat: initial full-stack nyaa-crawler implementation

- Node.js + TypeScript + Express backend using built-in node:sqlite
- React + Vite frontend with dark-themed UI
- Nyaa.si RSS polling via fast-xml-parser
- Watch list with show/episode CRUD and status tracking
- Auto-download scheduler with node-cron (configurable interval)
- .torrent file downloader with batch-release filtering
- Settings page for poll interval and quality defaults
- Dockerfile and docker-compose for Unraid deployment
- SQLite DB with migrations (shows, episodes, settings tables)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/client/pages/SettingsPage.tsx

@@ -0,0 +1,106 @@
+import { useEffect, useState } from 'react'
+import { api, type Settings } from '../api'
+
+export default function SettingsPage() {
+  const [settings, setSettings] = useState<Settings | null>(null)
+  const [form, setForm] = useState({ poll_interval_seconds: '', default_quality: '', default_sub_group: '' })
+  const [saving, setSaving] = useState(false)
+  const [saved, setSaved] = useState(false)
+  const [error, setError] = useState('')
+
+  useEffect(() => {
+    api.settings.get().then((s) => {
+      setSettings(s)
+      setForm({
+        poll_interval_seconds: s.poll_interval_seconds,
+        default_quality: s.default_quality,
+        default_sub_group: s.default_sub_group,
+      })
+    })
+  }, [])
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    setSaving(true)
+    setError('')
+    setSaved(false)
+    try {
+      const updated = await api.settings.update(form)
+      setSettings(updated)
+      setSaved(true)
+      setTimeout(() => setSaved(false), 3000)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Save failed')
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  if (!settings) return <div className="empty-state"><div className="spinner" /></div>
+
+  return (
+    <>
+      <div className="page-header">
+        <h1>Settings</h1>
+      </div>
+
+      <form onSubmit={handleSubmit} style={{ maxWidth: 480 }}>
+        <div className="card" style={{ marginBottom: 16 }}>
+          <div style={{ marginBottom: 16, fontWeight: 600 }}>Polling</div>
+
+          <div className="form-group" style={{ marginBottom: 16 }}>
+            <label>Poll Interval (seconds)</label>
+            <input
+              type="number"
+              min={60}
+              value={form.poll_interval_seconds}
+              onChange={(e) => setForm((f) => ({ ...f, poll_interval_seconds: e.target.value }))}
+            />
+            <p className="text-muted text-sm" style={{ marginTop: 4 }}>
+              Minimum 60 seconds. Default is 900 (15 minutes).
+            </p>
+          </div>
+        </div>
+
+        <div className="card" style={{ marginBottom: 16 }}>
+          <div style={{ marginBottom: 16, fontWeight: 600 }}>Defaults (applied to new shows)</div>
+
+          <div className="form-group" style={{ marginBottom: 12 }}>
+            <label>Default Quality</label>
+            <input
+              value={form.default_quality}
+              onChange={(e) => setForm((f) => ({ ...f, default_quality: e.target.value }))}
+              placeholder="1080p"
+            />
+          </div>
+
+          <div className="form-group">
+            <label>Default Sub Group</label>
+            <input
+              value={form.default_sub_group}
+              onChange={(e) => setForm((f) => ({ ...f, default_sub_group: e.target.value }))}
+              placeholder="SubsPlease"
+            />
+          </div>
+        </div>
+
+        <div className="card" style={{ marginBottom: 16 }}>
+          <div style={{ marginBottom: 8, fontWeight: 600 }}>Torrent Output Directory</div>
+          <code style={{ fontSize: 12, color: 'var(--text-muted)', wordBreak: 'break-all' }}>
+            {settings.torrent_output_dir}
+          </code>
+          <p className="text-muted text-sm" style={{ marginTop: 6 }}>
+            Configured via the <code>TORRENT_OUTPUT_DIR</code> environment variable.
+          </p>
+        </div>
+
+        {error && <p style={{ color: 'var(--red)', marginBottom: 12 }}>{error}</p>}
+        {saved && <p style={{ color: 'var(--green)', marginBottom: 12 }}>Settings saved.</p>}
+
+        <button type="submit" disabled={saving}>
+          {saving ? <span className="spinner" /> : 'Save Settings'}
+        </button>
+      </form>
+    </>
+  )
+}