Add upload email notifications with Seafile direct-upload watcher; v2.0.6

- Portal uploads send one email immediately (host, episode, passage,
  description, filenames) via Resend to NUGGETS_NOTIFY_EMAIL
- Seafile watcher polls /Episode Upload every 15 min for direct uploads
  and sends a notification for any new file not already seen via portal
- Files uploaded through the portal are marked seen so the watcher
  never sends a duplicate notification
- Credentials kept out of git: SEAFILE_TOKEN, SEAFILE_NUGGETS_REPO_ID,
  NUGGETS_NOTIFY_EMAIL now sourced from docker .env file

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

server/nuggets-seafile-watcher.js

@@ -0,0 +1,93 @@
+import { readFile, writeFile } from 'node:fs/promises'
+import { sendNuggetsUploadNotification } from './email.js'
+import {
+  SEAFILE_URL,
+  SEAFILE_TOKEN,
+  SEAFILE_NUGGETS_REPO_ID,
+  SEAFILE_EPISODE_UPLOAD_DIR,
+  SEAFILE_EPISODE_INFO_DIR,
+  SEAFILE_POLL_INTERVAL_MS,
+  NUGGETS_SEAFILE_SEEN_FILE,
+  NUGGETS_NOTIFY_EMAIL,
+} from './config.js'
+
+async function loadSeen() {
+  try {
+    return JSON.parse(await readFile(NUGGETS_SEAFILE_SEEN_FILE, 'utf8'))
+  } catch {
+    return { files: [] }
+  }
+}
+
+async function saveSeen(data) {
+  await writeFile(NUGGETS_SEAFILE_SEEN_FILE, JSON.stringify(data, null, 2), 'utf8')
+}
+
+// Called by the upload route after a successful portal upload so the poller
+// doesn't also fire a notification for the same file.
+export async function markSeafileFileSeen(filename) {
+  const data = await loadSeen()
+  if (!data.files.includes(filename)) {
+    data.files.push(filename)
+    await saveSeen(data)
+  }
+}
+
+async function listSeafileDir(dir) {
+  if (!SEAFILE_URL || !SEAFILE_TOKEN || !SEAFILE_NUGGETS_REPO_ID) return []
+  try {
+    const url = `${SEAFILE_URL}/api/v2.1/repos/${SEAFILE_NUGGETS_REPO_ID}/dir/?p=${encodeURIComponent(dir)}`
+    const res = await fetch(url, {
+      headers: { Authorization: `Token ${SEAFILE_TOKEN}` },
+      signal: AbortSignal.timeout(10_000),
+    })
+    if (!res.ok) return []
+    const data = await res.json()
+    return (data.dirent ?? []).filter(e => e.type === 'file').map(e => e.name)
+  } catch {
+    return []
+  }
+}
+
+async function poll() {
+  if (!SEAFILE_URL || !SEAFILE_TOKEN || !SEAFILE_NUGGETS_REPO_ID) return
+
+  const [uploadFiles, seen] = await Promise.all([
+    listSeafileDir(SEAFILE_EPISODE_UPLOAD_DIR),
+    loadSeen(),
+  ])
+
+  const seenSet = new Set(seen.files)
+  const newFiles = uploadFiles.filter(f => !seenSet.has(f))
+
+  if (newFiles.length === 0) return
+
+  for (const filename of newFiles) {
+    console.log(`[nuggets-watcher] new direct upload detected: ${filename}`)
+    await sendNuggetsUploadNotification({
+      to: NUGGETS_NOTIFY_EMAIL,
+      source: 'direct',
+      filename,
+    })
+    seenSet.add(filename)
+  }
+
+  seen.files = [...seenSet]
+  await saveSeen(seen)
+}
+
+export function startNuggetsSeafileWatcher() {
+  if (!SEAFILE_URL || !SEAFILE_TOKEN || !SEAFILE_NUGGETS_REPO_ID) {
+    console.log('[nuggets-watcher] Seafile not configured — watcher disabled.')
+    return
+  }
+  // Initial poll after 2 min (let the server settle), then every 15 min
+  setTimeout(() => {
+    poll().catch(err => console.error('[nuggets-watcher] poll error:', err))
+    setInterval(() => {
+      poll().catch(err => console.error('[nuggets-watcher] poll error:', err))
+    }, SEAFILE_POLL_INTERVAL_MS)
+  }, 2 * 60 * 1000)
+
+  console.log(`[nuggets-watcher] started — polling every ${SEAFILE_POLL_INTERVAL_MS / 60000} min`)
+}