fix: 清理死代码 + 修复群组模式预算支出计算

- 清理 store 中未使用的 loading 状态（stats/budget/category/user）
- 清理 stats store 冗余类型重导出和 catch 重置逻辑
- 清理 transaction store 未使用的 currentPage
- 清理 api/group 未使用的 GroupDetail/GroupMember/getGroupDetail
- 删除无引用的 api/index.ts barrel 导出文件
- 删除后端未调用的 GET /groups/:id 群组详情路由
- 合并 stats 页面重复的 loadTabData 函数
- 修复预算页群组模式下只算个人支出（不传 group_id）

client/src/stores/budget.ts

@@ -4,24 +4,12 @@ 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
-
 export const useBudgetStore = defineStore('budget', () => {
   const budget = ref<api.Budget | null>(null)
-  const loading = ref(false)
 
   async function fetchBudget(month?: string) {
-    loading.value = true
-    try {
-      const groupStore = useGroupStore()
-      budget.value = await api.getBudget(month || getCurrentMonth(), groupStore.currentGroupId)
-    } catch (err) {
-      budget.value = null
-      throw err
-    } finally {
-      loading.value = false
-    }
+    const groupStore = useGroupStore()
+    budget.value = await api.getBudget(month || getCurrentMonth(), groupStore.currentGroupId)
   }
 
   async function setBudget(amount: number, month?: string) {
@@ -29,5 +17,5 @@ export const useBudgetStore = defineStore('budget', () => {
     await fetchBudget(month)
   }
 
-  return { budget, loading, fetchBudget, setBudget }
+  return { budget, fetchBudget, setBudget }
 })

client/src/stores/category.ts

@@ -7,17 +7,9 @@ export type Category = api.Category
 
 export const useCategoryStore = defineStore('category', () => {
   const categories = ref<api.Category[]>([])
-  const loading = ref(false)
 
   async function fetchCategories() {
-    loading.value = true
-    try {
-      categories.value = await api.getCategories()
-    } catch {
-      categories.value = []
-    } finally {
-      loading.value = false
-    }
+    categories.value = await api.getCategories()
   }
 
   function getByType(type: 'expense' | 'income') {
@@ -53,5 +45,5 @@ export const useCategoryStore = defineStore('category', () => {
     await fetchCategories()
   }
 
-  return { categories, loading, fetchCategories, getByType, getById, addCategory, updateCategory, deleteCategory, migrateCategory, sortCategories }
+  return { categories, fetchCategories, getByType, getById, addCategory, updateCategory, deleteCategory, migrateCategory, sortCategories }
 })

client/src/stores/stats.ts

@@ -4,70 +4,54 @@ 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
-export type CategoryStat = api.CategoryStat
-export type TrendPoint = api.TrendPoint
+/** 默认概览数据，避免模板中访问属性报错 */
+const EMPTY_OVERVIEW: api.Overview = {
+  expense: 0, income: 0, expenseCount: 0, incomeCount: 0,
+  count: 0, daily: 0, dailyIncome: 0
+}
 
 export const useStatsStore = defineStore('stats', () => {
-  const overview = ref<api.Overview>({ expense: 0, income: 0, expenseCount: 0, incomeCount: 0, count: 0, daily: 0, dailyIncome: 0 })
+  const overview = ref<api.Overview>({ ...EMPTY_OVERVIEW })
   const categoryStats = ref<api.CategoryStat[]>([])
   const trendData = ref<api.TrendPoint[]>([])
-  const loading = ref(false)
+
+  /** 获取当前 group_id，统一收口 */
+  function getGroupId() {
+    return useGroupStore().currentGroupId
+  }
 
   async function fetchOverview(month?: string) {
-    loading.value = true
-    try {
-      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,
-        expenseCount: Number(data?.expenseCount) || 0,
-        incomeCount: Number(data?.incomeCount) || 0,
-        count: Number(data?.count) || 0,
-        daily: Number(data?.daily) || 0,
-        dailyIncome: Number(data?.dailyIncome) || 0
-      }
-    } catch (err) {
-      overview.value = { expense: 0, income: 0, expenseCount: 0, incomeCount: 0, count: 0, daily: 0, dailyIncome: 0 }
-      throw err
-    } finally {
-      loading.value = false
+    const data = await api.getOverview({
+      month: month || getCurrentMonth(),
+      group_id: getGroupId()
+    })
+    overview.value = {
+      expense: Number(data?.expense) || 0,
+      income: Number(data?.income) || 0,
+      expenseCount: Number(data?.expenseCount) || 0,
+      incomeCount: Number(data?.incomeCount) || 0,
+      count: Number(data?.count) || 0,
+      daily: Number(data?.daily) || 0,
+      dailyIncome: Number(data?.dailyIncome) || 0
     }
   }
 
   async function fetchCategoryStats(month?: string, type: string = 'expense') {
-    try {
-      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,
-        count: Number(item.count) || 0
-      })) : []
-    } catch (err) {
-      categoryStats.value = []
-      throw err
-    }
+    const data = await api.getCategoryStats(month || getCurrentMonth(), type, getGroupId())
+    categoryStats.value = Array.isArray(data) ? data.map(item => ({
+      ...item,
+      amount: Number(item.amount) || 0,
+      count: Number(item.count) || 0
+    })) : []
   }
 
   async function fetchTrend(month?: string, type: string = 'expense') {
-    try {
-      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
-      })) : []
-    } catch (err) {
-      trendData.value = []
-      throw err
-    }
+    const data = await api.getTrend(month || getCurrentMonth(), type, getGroupId())
+    trendData.value = Array.isArray(data) ? data.map(item => ({
+      ...item,
+      amount: Number(item.amount) || 0
+    })) : []
   }
 
-  return { overview, categoryStats, trendData, loading, fetchOverview, fetchCategoryStats, fetchTrend }
+  return { overview, categoryStats, trendData, fetchOverview, fetchCategoryStats, fetchTrend }
 })

client/src/stores/transaction.ts

@@ -7,7 +7,6 @@ export const useTransactionStore = defineStore('transaction', () => {
   const transactions = ref<api.Transaction[]>([])
   const total = ref(0)
   const loading = ref(false)
-  const currentPage = ref(1)
 
   async function fetchTransactions(params?: api.TransactionParams) {
     loading.value = true
@@ -67,5 +66,5 @@ export const useTransactionStore = defineStore('transaction', () => {
     }
   }
 
-  return { transactions, total, loading, currentPage, fetchTransactions, addTransaction, updateTransaction, deleteTransaction, fetchTransactionById }
+  return { transactions, total, loading, fetchTransactions, addTransaction, updateTransaction, deleteTransaction, fetchTransactionById }
 })

client/src/stores/user.ts

@@ -5,7 +5,6 @@ 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'
@@ -21,18 +20,10 @@ export const useUserStore = defineStore('user', () => {
   })
 
   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)
-      throw e
-    } finally {
-      loading.value = false
+    userInfo.value = await api.getUserInfo()
+    if (userInfo.value) {
+      uni.setStorageSync('xc:nickname', userInfo.value.nickname)
+      uni.setStorageSync('xc:avatar_url', userInfo.value.avatar_url)
     }
   }
 
@@ -49,5 +40,5 @@ export const useUserStore = defineStore('user', () => {
     return avatarUrl.value
   }
 
-  return { userInfo, loading, nickname, avatarUrl, fetchUserInfo, updateProfile, uploadAvatar }
+  return { userInfo, nickname, avatarUrl, fetchUserInfo, updateProfile, uploadAvatar }
 })