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/api/images/count.get.ts

@@ -1,5 +1,7 @@
 import { getImageUserFilter, requireApiOrAdminAuth } from '../../utils/access'
 import { isValidFolderName } from '../../utils/image-key'
+import { readBackendIdQuery } from '../../utils/image-query'
+import { createApiError } from '../../utils/api-error'
 import { countImages } from '../../utils/storage'
 
 export default defineEventHandler(async (event) => {
@@ -9,8 +11,12 @@ export default defineEventHandler(async (event) => {
   const query = getQuery(event)
   const raw = typeof query.folder === 'string' ? query.folder.trim() : ''
   const folder = raw && raw !== 'all' && isValidFolderName(raw) ? raw : undefined
+  const backendId = readBackendIdQuery(query)
+  if (backendId === null) {
+    createApiError(event, 'INVALID_REQUEST', '无效的存储后端', 400)
+  }
 
-  const total = await countImages(folder, userFilter)
+  const total = await countImages(folder, userFilter, backendId)
 
   return { total }
 })