fix: disable PocketBase SDK auto-cancellation on group API calls

SSE subscriptions trigger concurrent requests to the same endpoints,
causing auto-cancellation errors. Add $autoCancel: false to group
queries that get called from realtime event handlers.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/api/groups.ts

@@ -25,14 +25,16 @@ export async function getUserGroups(): Promise<Group[]> {
   if (!user) return []
 
   return pb.collection('groups').getList(1, 50, {
-    filter: `members ~ "${user.id}"`
+    filter: `members ~ "${user.id}"`,
+    $autoCancel: false
   }).then(res => res.items as unknown as Group[])
 }
 
 // 获取群组详情
 export async function getGroup(groupId: string): Promise<Group> {
   return pb.collection('groups').getOne(groupId, {
-    expand: 'members'
+    expand: 'members',
+    $autoCancel: false
   }) as unknown as Group
 }
 
@@ -82,7 +84,8 @@ export async function getGroupJoinRequests(groupId: string): Promise<JoinRequest
   const result = await pb.collection('join_requests').getList(1, 50, {
     filter: `group="${groupId}" && status="pending"`,
     sort: '-created',
-    expand: 'user'
+    expand: 'user',
+    $autoCancel: false
   })
   return result.items as unknown as JoinRequest[]
 }
@@ -95,7 +98,8 @@ export async function getMyGroupsJoinRequests(): Promise<JoinRequest[]> {
   const result = await pb.collection('join_requests').getList(1, 50, {
     filter: `group.owner="${user.id}" && status="pending"`,
     sort: '-created',
-    expand: 'user,group'
+    expand: 'user,group',
+    $autoCancel: false
   })
   return result.items as unknown as JoinRequest[]
 }
@@ -184,10 +188,17 @@ export function subscribeJoinRequests(groupId: string, callback: (request: JoinR
 // 获取群组成员
 export async function getGroupMembers(groupId: string) {
   const group = await getGroup(groupId)
+  
+  if (group.expand?.members) {
+    return group.expand.members
+  }
+
   const members = group.members as string[]
+  if (!members || members.length === 0) return []
 
   const users = await pb.collection('users').getList(1, 50, {
-    filter: members.map(id => `id="${id}"`).join(' || ')
+    filter: members.map(id => `id="${id}"`).join(' || '),
+    $autoCancel: false
   })
 
   return users.items