feat: Stream consumer groups UI

- stream.ts: streamGroups, streamConsumers, streamGroupCreate, streamGroupDestroy, streamAck
- IPC: redis:streamGroups, streamConsumers, streamGroupCreate, streamGroupDestroy, streamAck
- Preload bridge + types for all new methods
- StreamEditor.vue: collapsible consumer groups panel
  - XINFO GROUPS table with name/consumers/pending/last-delivered-id
  - Click group to expand XINFO CONSUMERS
  - Create group dialog (name, start ID, MKSTREAM)
  - Destroy group with confirm
- i18n keys (zh-CN + en)
- P1 complete!

electron/main/redis/stream.ts

@@ -35,3 +35,38 @@ export async function streamDel(id: string, key: string, ...ids: string[]): Prom
   if (!client) throw new Error(`Client ${id} not found`)
   return client.xdel(key, ...ids)
 }
+
+// Consumer group operations
+export async function streamGroups(id: string, key: string): Promise<any[]> {
+  const client = getClient(id)
+  if (!client) throw new Error(`Client ${id} not found`)
+  return client.xinfo('GROUPS', key) as Promise<any[]>
+}
+
+export async function streamConsumers(id: string, key: string, group: string): Promise<any[]> {
+  const client = getClient(id)
+  if (!client) throw new Error(`Client ${id} not found`)
+  return client.xinfo('CONSUMERS', key, group) as Promise<any[]>
+}
+
+export async function streamGroupCreate(
+  id: string, key: string, group: string, startId: string, mkstream: boolean
+): Promise<string> {
+  const client = getClient(id)
+  if (!client) throw new Error(`Client ${id} not found`)
+  const args: any[] = [key, group, startId]
+  if (mkstream) args.push('MKSTREAM')
+  return (client as any).xgroup('CREATE', ...args)
+}
+
+export async function streamGroupDestroy(id: string, key: string, group: string): Promise<number> {
+  const client = getClient(id)
+  if (!client) throw new Error(`Client ${id} not found`)
+  return (client as any).xgroup('DESTROY', key, group)
+}
+
+export async function streamAck(id: string, key: string, group: string, ...ids: string[]): Promise<number> {
+  const client = getClient(id)
+  if (!client) throw new Error(`Client ${id} not found`)
+  return (client as any).xack(key, group, ...ids)
+}