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/ipc-handlers.ts

@@ -232,6 +232,23 @@ export function registerIpcHandlers(): void {
     return redis.streamDel(id, key, ...ids)
   }))
 
+  // Redis - Stream Consumer Groups
+  ipcMain.handle('redis:streamGroups', async (_e, id: string, key: string) => {
+    return redis.streamGroups(id, key)
+  })
+  ipcMain.handle('redis:streamConsumers', async (_e, id: string, key: string, group: string) => {
+    return redis.streamConsumers(id, key, group)
+  })
+  ipcMain.handle('redis:streamGroupCreate', withLog('XGROUP CREATE', async (_e, id: string, key: string, group: string, startId: string, mkstream: boolean) => {
+    return redis.streamGroupCreate(id, key, group, startId, mkstream)
+  }))
+  ipcMain.handle('redis:streamGroupDestroy', withLog('XGROUP DESTROY', async (_e, id: string, key: string, group: string) => {
+    return redis.streamGroupDestroy(id, key, group)
+  }))
+  ipcMain.handle('redis:streamAck', withLog('XACK', async (_e, id: string, key: string, group: string, ids: string[]) => {
+    return redis.streamAck(id, key, group, ...ids)
+  }))
+
   // Command Log
   ipcMain.handle('redis:getCommandLog', () => {
     return redis.getLog()