feat: add GameGroup2 project with frontend and backend

- Add .gitignore for Node.js and PocketBase projects
- Add frontend (Vue 3 + Vite + TypeScript)
- Add backend (PocketBase)
- Add deployment scripts and Docker compose configs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/api/invitations.ts

@@ -0,0 +1,116 @@
+// src/api/invitations.ts
+import pb from './pocketbase'
+import type { Invitation, InviteStatus } from '@/types'
+import { joinTeamSession } from './sessions'
+import { updateUserStatus } from './users'
+
+// 发送邀请
+export async function sendInvitation(data: {
+  to: string
+  teamSession: string
+}) {
+  const user = pb.authStore.model
+  if (!user) throw new Error('未登录')
+
+  // 检查是否已有待处理邀请
+  const existing = await pb.collection('invitations').getList(1, 1, {
+    filter: `from="${user.id}" && to="${data.to}" && teamSession="${data.teamSession}" && status="pending"`
+  })
+
+  if (existing.items.length > 0) {
+    throw new Error('已有待处理的邀请')
+  }
+
+  return pb.collection('invitations').create({
+    ...data,
+    from: user.id,
+    status: 'pending'
+  })
+}
+
+// 批量发送邀请
+export async function sendBulkInvitations(recipients: string[], teamSessionId: string) {
+  const promises = recipients.map(to =>
+    sendInvitation({ to, teamSession: teamSessionId })
+  )
+
+  return Promise.allSettled(promises)
+}
+
+// 获取用户的待处理邀请
+export async function getPendingInvitations(): Promise<Invitation[]> {
+  const user = pb.authStore.model
+  if (!user) return []
+
+  const result = await pb.collection('invitations').getList(1, 50, {
+    filter: `to="${user.id}" && status="pending"`,
+    sort: '-created',
+    expand: 'from,teamSession'
+  })
+
+  return result.items as unknown as Invitation[]
+}
+
+// 获取我发送的邀请
+export async function getMySentInvitations(): Promise<Invitation[]> {
+  const user = pb.authStore.model
+  if (!user) return []
+
+  const result = await pb.collection('invitations').getList(1, 50, {
+    filter: `from="${user.id}"`,
+    sort: '-created',
+    expand: 'to,teamSession'
+  })
+
+  return result.items as unknown as Invitation[]
+}
+
+// 响应邀请
+export async function respondInvitation(
+  invitationId: string,
+  response: 'accepted' | 'rejected',
+  rejectReason?: string
+) {
+  const user = pb.authStore.model
+  if (!user) throw new Error('未登录')
+
+  const invitation = await pb.collection('invitations').getOne(invitationId)
+
+  if (invitation.to !== user.id) {
+    throw new Error('无权操作此邀请')
+  }
+
+  const updateData: Partial<Invitation> = {
+    status: response as InviteStatus,
+    respondedAt: new Date().toISOString()
+  }
+
+  if (response === 'rejected' && rejectReason) {
+    updateData.rejectReason = rejectReason
+  }
+
+  // 更新邀请状态
+  await pb.collection('invitations').update(invitationId, updateData)
+
+  // 如果接受，加入临时小组
+  if (response === 'accepted') {
+    await joinTeamSession(invitation.teamSession)
+    // 更新用户状态
+    await updateUserStatus('in_team')
+  }
+
+  return updateData
+}
+
+// 订阅邀请变更
+export function subscribeInvitations(callback: (invitation: Invitation) => void) {
+  const user = pb.authStore.model
+  if (!user) return () => {}
+
+  return pb.collection('invitations').subscribe('*', (payload) => {
+    const invite = payload.record as unknown as Invitation
+    if (invite.to === user.id || invite.from === user.id) {
+      callback(invite)
+    }
+  })
+}