feat: 完成任务1 - 建立项目版本管理和基础架构

任务1.1  初始化 Git 版本控制
- 建立 Git 仓库并连接到阿里云服务器
- 创建 .gitignore 和项目文档
- 建立 master/develop 分支管理策略

任务1.2  搭建前端项目基础架构
- 创建 Vue.js 3 + TypeScript 项目
- 集成 Tailwind CSS 和温暖现代主义设计系统
- 实现基础 UI 组件库（BaseButton, BaseCard, BaseInput）
- 建立路由结构和页面组件
- 配置 Vite 构建工具

任务1.3  配置 Capacitor 和本地存储
- 集成 Capacitor.js 并生成 Android 项目
- 配置 SQLite 数据库和数据模型
- 实现完整的数据库服务层
- 创建 Pinia 状态管理 store
- 建立本地数据 CRUD 操作基础

技术栈：Vue 3 + TypeScript + Tailwind CSS + Capacitor + SQLite

frontend/src/stores/database.ts

@@ -0,0 +1,174 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { databaseService, type Transaction, type Category, type Account } from '@/services/database'
+
+export const useDatabaseStore = defineStore('database', () => {
+  const isInitialized = ref(false)
+  const isLoading = ref(false)
+  const error = ref<string | null>(null)
+
+  // 数据状态
+  const transactions = ref<Transaction[]>([])
+  const categories = ref<Category[]>([])
+  const accounts = ref<Account[]>([])
+
+  // 初始化数据库
+  async function initialize() {
+    if (isInitialized.value) return
+
+    isLoading.value = true
+    error.value = null
+
+    try {
+      await databaseService.initialize()
+      await loadInitialData()
+      isInitialized.value = true
+      console.log('Database store initialized successfully')
+    } catch (err) {
+      error.value = err instanceof Error ? err.message : 'Database initialization failed'
+      console.error('Database store initialization failed:', err)
+    } finally {
+      isLoading.value = false
+    }
+  }
+
+  // 加载初始数据
+  async function loadInitialData() {
+    try {
+      const [transactionsData, categoriesData, accountsData] = await Promise.all([
+        databaseService.getTransactions(20, 0),
+        databaseService.getCategories(),
+        databaseService.getAccounts()
+      ])
+
+      transactions.value = transactionsData
+      categories.value = categoriesData
+      accounts.value = accountsData
+    } catch (err) {
+      console.error('Failed to load initial data:', err)
+      throw err
+    }
+  }
+
+  // 交易操作
+  async function addTransaction(transaction: Omit<Transaction, 'id'>) {
+    try {
+      const id = await databaseService.createTransaction(transaction)
+      const newTransaction = { ...transaction, id }
+      transactions.value.unshift(newTransaction)
+      return id
+    } catch (err) {
+      console.error('Failed to add transaction:', err)
+      throw err
+    }
+  }
+
+  async function updateTransaction(id: number, updates: Partial<Transaction>) {
+    try {
+      await databaseService.updateTransaction(id, updates)
+      const index = transactions.value.findIndex(t => t.id === id)
+      if (index !== -1) {
+        transactions.value[index] = { ...transactions.value[index], ...updates }
+      }
+    } catch (err) {
+      console.error('Failed to update transaction:', err)
+      throw err
+    }
+  }
+
+  async function deleteTransaction(id: number) {
+    try {
+      await databaseService.deleteTransaction(id)
+      const index = transactions.value.findIndex(t => t.id === id)
+      if (index !== -1) {
+        transactions.value.splice(index, 1)
+      }
+    } catch (err) {
+      console.error('Failed to delete transaction:', err)
+      throw err
+    }
+  }
+
+  // 分类操作
+  async function addCategory(category: Omit<Category, 'id'>) {
+    try {
+      const id = await databaseService.createCategory(category)
+      const newCategory = { ...category, id }
+      categories.value.push(newCategory)
+      return id
+    } catch (err) {
+      console.error('Failed to add category:', err)
+      throw err
+    }
+  }
+
+  // 账户操作
+  async function addAccount(account: Omit<Account, 'id'>) {
+    try {
+      const id = await databaseService.createAccount(account)
+      const newAccount = { ...account, id }
+      accounts.value.push(newAccount)
+      return id
+    } catch (err) {
+      console.error('Failed to add account:', err)
+      throw err
+    }
+  }
+
+  // 获取默认分类和账户
+  function getDefaultCategory(type: 'income' | 'expense'): Category | undefined {
+    return categories.value.find(c => c.is_default && (c.type === type || c.type === 'both'))
+  }
+
+  function getDefaultAccount(): Account | undefined {
+    return accounts.value.find(a => a.is_default)
+  }
+
+  // 搜索和筛选
+  function searchTransactions(query: string): Transaction[] {
+    if (!query.trim()) return transactions.value
+
+    const lowerQuery = query.toLowerCase()
+    return transactions.value.filter(t => 
+      t.merchant.toLowerCase().includes(lowerQuery) ||
+      (t.description && t.description.toLowerCase().includes(lowerQuery))
+    )
+  }
+
+  function filterTransactionsByCategory(categoryId: number): Transaction[] {
+    return transactions.value.filter(t => t.category_id === categoryId)
+  }
+
+  function filterTransactionsByAccount(accountId: number): Transaction[] {
+    return transactions.value.filter(t => t.account_id === accountId)
+  }
+
+  function filterTransactionsByDateRange(startDate: string, endDate: string): Transaction[] {
+    return transactions.value.filter(t => t.date >= startDate && t.date <= endDate)
+  }
+
+  return {
+    // 状态
+    isInitialized,
+    isLoading,
+    error,
+    transactions,
+    categories,
+    accounts,
+
+    // 方法
+    initialize,
+    loadInitialData,
+    addTransaction,
+    updateTransaction,
+    deleteTransaction,
+    addCategory,
+    addAccount,
+    getDefaultCategory,
+    getDefaultAccount,
+    searchTransactions,
+    filterTransactionsByCategory,
+    filterTransactionsByAccount,
+    filterTransactionsByDateRange
+  }
+})