feat: 迭代三大模块 + 全系统 Bug 修复

新功能：
- 账单筛选统计：多维度筛选面板 + 保存方案 + 结果统计
- 通知公告：系统公告/群组通知/个人提醒 + 通知中心页面
- 管理员后台：数据看板 + 用户管理 + 发布公告

Bug 修复：
- 统计页 fetchPrevMonthData/fetchMaxSingle 添加 group_id
- 群组视图添加 t.group_id 过滤，防止私人数据泄露
- 通知列表添加群组通知条件
- 通知标记已读添加错误处理
- 管理员 API 添加 affectedRows 检查
- 筛选面板金额为 0 时正确回填
- profile onShow 补充 userStore.fetchUserInfo
- 全系统样式修复（overflow/box-sizing）

client/src/stores/filter.ts

@@ -0,0 +1,25 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import * as api from '@/api/filter'
+import type { FilterParams } from '@/api/filter'
+
+export const useFilterStore = defineStore('filter', () => {
+  const savedFilters = ref<api.SavedFilter[]>([])
+
+  async function fetchSavedFilters() {
+    savedFilters.value = await api.getSavedFilters()
+  }
+
+  async function saveFilter(name: string, filters: FilterParams) {
+    const result = await api.saveFilter({ name, filters })
+    await fetchSavedFilters()
+    return result.id
+  }
+
+  async function deleteFilter(id: number) {
+    await api.deleteFilter(id)
+    savedFilters.value = savedFilters.value.filter(f => f.id !== id)
+  }
+
+  return { savedFilters, fetchSavedFilters, saveFilter, deleteFilter }
+})

client/src/stores/notification.ts

@@ -0,0 +1,24 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import * as api from '@/api/notification'
+
+export const useNotificationStore = defineStore('notification', () => {
+  const unreadCount = ref(0)
+
+  async function fetchUnreadCount() {
+    const data = await api.getUnreadCount()
+    unreadCount.value = data.count
+  }
+
+  async function markRead(id: number) {
+    await api.markRead(id)
+    if (unreadCount.value > 0) unreadCount.value--
+  }
+
+  async function markAllRead() {
+    await api.markAllRead()
+    unreadCount.value = 0
+  }
+
+  return { unreadCount, fetchUnreadCount, markRead, markAllRead }
+})

client/src/stores/transaction.ts

@@ -19,6 +19,7 @@ export const useTransactionStore = defineStore('transaction', () => {
       })
       transactions.value = data.list
       total.value = data.total
+      return data
     } catch (err) {
       transactions.value = []
       total.value = 0

client/src/stores/user.ts

@@ -24,6 +24,7 @@ export const useUserStore = defineStore('user', () => {
     if (userInfo.value) {
       uni.setStorageSync('xc:nickname', userInfo.value.nickname)
       uni.setStorageSync('xc:avatar_url', userInfo.value.avatar_url)
+      uni.setStorageSync('xc:role', userInfo.value.role)
     }
   }