feat: 用户信息完善 + 一起记功能

- users 表添加 nickname、avatar_url 字段
- 用户信息 API（GET/PUT /me）+ 头像上传（multer）
- 头像通过 API 路由获取（公开，不经过 auth）
- 登录接口返回用户昵称和头像
- 用户信息 Store + 个人资料编辑页面
- 我的页面和首页显示真实用户信息
- 群组表（groups、group_members）+ transactions 添加 group_id
- 群组 API（创建/加入/退出/解散）
- 交易和统计 API 支持 group_id 视图切换
- 群组客户端 Store + 身份切换
- 群组管理页面
- App 初始化群组 Store
- UPLOAD_DIR 配置化
- Node.js 备份替代 mysqldump
- 统一前端 BASE_URL（config.ts）
- uploads 加入 .gitignore
- 修复 trust proxy 警告

client/src/stores/budget.ts

@@ -2,6 +2,7 @@ import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import * as api from '@/api/budget'
 import { getCurrentMonth } from '@/utils/format'
+import { useGroupStore } from '@/stores/group'
 
 // 重新导出类型以保持向后兼容
 export type Budget = api.Budget
@@ -13,7 +14,8 @@ export const useBudgetStore = defineStore('budget', () => {
   async function fetchBudget(month?: string) {
     loading.value = true
     try {
-      budget.value = await api.getBudget(month || getCurrentMonth())
+      const groupStore = useGroupStore()
+      budget.value = await api.getBudget(month || getCurrentMonth(), groupStore.currentGroupId)
     } catch {
       budget.value = null
     } finally {

client/src/stores/group.ts

@@ -0,0 +1,113 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import * as api from '@/api/group'
+import { useStatsStore } from '@/stores/stats'
+import { useBudgetStore } from '@/stores/budget'
+import { useTransactionStore } from '@/stores/transaction'
+
+export const useGroupStore = defineStore('group', () => {
+  const groups = ref<api.Group[]>([])
+  const loading = ref(false)
+
+  /** 当前选中的群组 ID，null 表示个人模式 */
+  const currentGroupId = ref<number | null>(null)
+
+  /** 当前群组信息 */
+  const currentGroup = computed(() => {
+    if (currentGroupId.value === null) return null
+    return groups.value.find(g => g.id === currentGroupId.value) || null
+  })
+
+  /** 是否处于群组模式 */
+  const isGroupMode = computed(() => currentGroupId.value !== null)
+
+  /** 切换到个人模式 */
+  function switchToPersonal() {
+    currentGroupId.value = null
+    uni.removeStorageSync('xc:currentGroupId')
+    refreshAll()
+  }
+
+  /** 切换到群组模式 */
+  function switchToGroup(groupId: number) {
+    currentGroupId.value = groupId
+    uni.setStorageSync('xc:currentGroupId', groupId)
+    refreshAll()
+  }
+
+  /** 切换身份后全局刷新所有数据 */
+  function refreshAll() {
+    const statsStore = useStatsStore()
+    const budgetStore = useBudgetStore()
+    const txStore = useTransactionStore()
+    statsStore.fetchOverview()
+    budgetStore.fetchBudget()
+    txStore.fetchTransactions({ page: 1 })
+  }
+
+  /** 获取群组列表 */
+  async function fetchGroups() {
+    loading.value = true
+    try {
+      groups.value = await api.getGroups()
+    } catch {
+      groups.value = []
+    } finally {
+      loading.value = false
+    }
+
+    // 验证 currentGroupId 是否仍有效（群组可能已被解散或退出）
+    if (currentGroupId.value !== null) {
+      const stillValid = groups.value.some(g => g.id === currentGroupId.value)
+      if (!stillValid) {
+        switchToPersonal()
+      }
+    }
+  }
+
+  /** 创建群组 */
+  async function createGroup(name: string) {
+    const result = await api.createGroup({ name })
+    await fetchGroups()
+    return result
+  }
+
+  /** 加入群组 */
+  async function joinGroup(inviteCode: string) {
+    const result = await api.joinGroup(inviteCode)
+    await fetchGroups()
+    return result
+  }
+
+  /** 退出群组 */
+  async function leaveGroup(groupId: number) {
+    await api.leaveGroup(groupId)
+    if (currentGroupId.value === groupId) {
+      switchToPersonal()
+    }
+    await fetchGroups()
+  }
+
+  /** 解散群组 */
+  async function deleteGroup(groupId: number) {
+    await api.deleteGroup(groupId)
+    if (currentGroupId.value === groupId) {
+      switchToPersonal()
+    }
+    await fetchGroups()
+  }
+
+  /** 初始化：从本地存储恢复选中状态 */
+  function init() {
+    const saved = uni.getStorageSync('xc:currentGroupId')
+    if (saved) {
+      currentGroupId.value = saved
+    }
+  }
+
+  return {
+    groups, loading, currentGroupId, currentGroup, isGroupMode,
+    switchToPersonal, switchToGroup, refreshAll,
+    fetchGroups, createGroup, joinGroup, leaveGroup, deleteGroup, init
+  }
+})

client/src/stores/stats.ts

@@ -2,6 +2,7 @@ import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import * as api from '@/api/stats'
 import { getCurrentMonth } from '@/utils/format'
+import { useGroupStore } from '@/stores/group'
 
 // 重新导出类型以保持向后兼容
 export type Overview = api.Overview
@@ -15,8 +16,11 @@ export const useStatsStore = defineStore('stats', () => {
 
   async function fetchOverview(month?: string) {
     try {
-      const data = await api.getOverview({ month: month || getCurrentMonth() })
-      // 确保数据字段是数字类型
+      const groupStore = useGroupStore()
+      const data = await api.getOverview({
+        month: month || getCurrentMonth(),
+        group_id: groupStore.currentGroupId
+      })
       overview.value = {
         expense: Number(data?.expense) || 0,
         income: Number(data?.income) || 0,
@@ -30,8 +34,8 @@ export const useStatsStore = defineStore('stats', () => {
 
   async function fetchCategoryStats(month?: string, type: string = 'expense') {
     try {
-      const data = await api.getCategoryStats(month || getCurrentMonth(), type)
-      // 确保返回的是数组，且金额是数字
+      const groupStore = useGroupStore()
+      const data = await api.getCategoryStats(month || getCurrentMonth(), type, groupStore.currentGroupId)
       categoryStats.value = Array.isArray(data) ? data.map(item => ({
         ...item,
         amount: Number(item.amount) || 0,
@@ -44,8 +48,8 @@ export const useStatsStore = defineStore('stats', () => {
 
   async function fetchTrend(month?: string, type: string = 'expense') {
     try {
-      const data = await api.getTrend(month || getCurrentMonth(), type)
-      // 确保返回的是数组，且金额是数字
+      const groupStore = useGroupStore()
+      const data = await api.getTrend(month || getCurrentMonth(), type, groupStore.currentGroupId)
       trendData.value = Array.isArray(data) ? data.map(item => ({
         ...item,
         amount: Number(item.amount) || 0

client/src/stores/transaction.ts

@@ -1,6 +1,7 @@
 import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import * as api from '@/api/transaction'
+import { useGroupStore } from '@/stores/group'
 
 export const useTransactionStore = defineStore('transaction', () => {
   const transactions = ref<api.Transaction[]>([])
@@ -11,7 +12,12 @@ export const useTransactionStore = defineStore('transaction', () => {
   async function fetchTransactions(params?: api.TransactionParams) {
     loading.value = true
     try {
-      const data = await api.getTransactions({ page: 1, ...params })
+      const groupStore = useGroupStore()
+      const data = await api.getTransactions({
+        page: 1,
+        ...params,
+        group_id: groupStore.currentGroupId
+      })
       transactions.value = data.list
       total.value = data.total
       currentPage.value = data.page
@@ -30,7 +36,11 @@ export const useTransactionStore = defineStore('transaction', () => {
     note?: string
     date: string
   }) {
-    const result = await api.createTransaction(data)
+    const groupStore = useGroupStore()
+    const result = await api.createTransaction({
+      ...data,
+      group_id: groupStore.currentGroupId
+    })
     return result.id
   }
 

client/src/stores/user.ts

@@ -0,0 +1,52 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import * as api from '@/api/user'
+import { API_BASE } from '@/config'
+
+export const useUserStore = defineStore('user', () => {
+  const userInfo = ref<api.UserInfo | null>(null)
+  const loading = ref(false)
+
+  const nickname = computed(() => {
+    return userInfo.value?.nickname || uni.getStorageSync('xc:nickname') || '小菜'
+  })
+
+  const avatarUrl = computed(() => {
+    const filename = userInfo.value?.avatar_url || uni.getStorageSync('xc:avatar_url') || ''
+    if (!filename) return ''
+    // 已是完整 URL（http/blob）直接返回
+    if (filename.startsWith('http') || filename.startsWith('blob:')) return filename
+    // 拼接：API_BASE + /user/avatar/ + 文件名
+    return `${API_BASE}/user/avatar/${filename}`
+  })
+
+  async function fetchUserInfo() {
+    loading.value = true
+    try {
+      userInfo.value = await api.getUserInfo()
+      if (userInfo.value) {
+        uni.setStorageSync('xc:nickname', userInfo.value.nickname)
+        uni.setStorageSync('xc:avatar_url', userInfo.value.avatar_url)
+      }
+    } catch (e) {
+      console.error('[UserStore] fetchUserInfo error:', e)
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function updateProfile(nickname: string) {
+    await api.updateNickname(nickname)
+    if (userInfo.value) userInfo.value.nickname = nickname
+    uni.setStorageSync('xc:nickname', nickname)
+  }
+
+  async function uploadAvatar(filePath: string) {
+    const result = await api.uploadAvatar(filePath)
+    if (userInfo.value) userInfo.value.avatar_url = result.avatar_url
+    uni.setStorageSync('xc:avatar_url', result.avatar_url)
+    return avatarUrl.value
+  }
+
+  return { userInfo, loading, nickname, avatarUrl, fetchUserInfo, updateProfile, uploadAvatar }
+})