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/storage-backends.get.ts

@@ -0,0 +1,30 @@
+import { requireUserAuth } from '../utils/access'
+import {
+  ensureStorageSchema,
+  listStorageBackendNameMap,
+  LOCAL_BACKEND_ID
+} from '../utils/storage-backends'
+
+function sortBackendsForFilter<T extends { id: string, name: string }>(backends: T[]): T[] {
+  return [...backends].sort((a, b) => {
+    if (a.id === LOCAL_BACKEND_ID) return -1
+    if (b.id === LOCAL_BACKEND_ID) return 1
+    return a.name.localeCompare(b.name, 'zh-CN')
+  })
+}
+
+export default defineEventHandler(async (event) => {
+  await requireUserAuth(event)
+  ensureStorageSchema()
+
+  const map = listStorageBackendNameMap()
+  const backends = sortBackendsForFilter(
+    Array.from(map.entries()).map(([id, backend]) => ({
+      id,
+      name: backend.name,
+      type: backend.type
+    }))
+  )
+
+  return { backends }
+})