feat: activity logs, gallery storage filter, and upload rate limits

Add per-user activity logs with storage backend tracking, gallery
storage filter, and IP/token upload rate limiting. Fix storage delete
modal flash, pin local backend in filter order, and link settings
version to GitHub releases.

server/utils/rate-limit.ts

@@ -0,0 +1,67 @@
+import { createHash } from 'node:crypto'
+import { createError, getHeader, type H3Event } from 'h3'
+import { clientIp } from './logger'
+
+const UPLOAD_IP_MAX = 60
+const UPLOAD_TOKEN_MAX = 120
+const UPLOAD_WINDOW_MS = 15 * 60 * 1000
+
+const stores = new Map<string, Map<string, { count: number, resetAt: number }>>()
+
+function getStore(name: string): Map<string, { count: number, resetAt: number }> {
+  let store = stores.get(name)
+  if (!store) {
+    store = new Map()
+    stores.set(name, store)
+  }
+  return store
+}
+
+function assertRateLimit(
+  storeName: string,
+  key: string,
+  max: number,
+  windowMs: number,
+  message: string
+): void {
+  const store = getStore(storeName)
+  const now = Date.now()
+  const entry = store.get(key)
+
+  if (!entry || now > entry.resetAt) {
+    store.set(key, { count: 1, resetAt: now + windowMs })
+    return
+  }
+
+  entry.count += 1
+  if (entry.count > max) {
+    throw createError({
+      statusCode: 429,
+      statusMessage: message
+    })
+  }
+}
+
+export function checkUploadRateLimit(event: H3Event, apiToken?: string): void {
+  const ip = clientIp(event)
+  assertRateLimit(
+    'upload-ip',
+    ip,
+    UPLOAD_IP_MAX,
+    UPLOAD_WINDOW_MS,
+    '上传过于频繁，请稍后再试'
+  )
+
+  const headerToken = getHeader(event, 'auth-token')?.trim() ?? ''
+  const token = apiToken?.trim() || headerToken
+  if (!token) return
+
+  const hash = createHash('sha256').update(token).digest('hex').slice(0, 32)
+  assertRateLimit(
+    'upload-token',
+    hash,
+    UPLOAD_TOKEN_MAX,
+    UPLOAD_WINDOW_MS,
+    '上传过于频繁，请稍后再试'
+  )
+}