feat: xiaji-go v1.0.0 - 智能记账机器人

- Telegram Bot + QQ Bot (WebSocket) 双平台支持
- 150+ 预设分类关键词，jieba 智能分词
- Web 管理后台（记录查看/删除/CSV导出）
- 金额精确存储（分/int64）
- 版本信息嵌入（编译时注入）
- Docker 支持
- 优雅关闭（context + signal）

internal/service/finance.go

@@ -0,0 +1,116 @@
+package service
+
+import (
+	"math"
+	"regexp"
+	"strconv"
+	"time"
+
+	"xiaji-go/models"
+
+	"github.com/yanyiwu/gojieba"
+	"gorm.io/gorm"
+)
+
+type FinanceService struct {
+	db    *gorm.DB
+	jieba *gojieba.Jieba
+}
+
+func NewFinanceService(db *gorm.DB) *FinanceService {
+	return &FinanceService{
+		db:    db,
+		jieba: gojieba.NewJieba(),
+	}
+}
+
+func (s *FinanceService) Close() {
+	s.jieba.Free()
+}
+
+// ParseText 从自然语言文本中提取金额（分）和分类
+func (s *FinanceService) ParseText(text string) (int64, string) {
+	// 1. 提取金额 — 优先匹配带单位的，如 "15.5元"、"¥30"、"20块"
+	amountPatterns := []*regexp.Regexp{
+		regexp.MustCompile(`[¥￥]\s*(\d+\.?\d*)`),
+		regexp.MustCompile(`(\d+\.?\d*)\s*[元块]`),
+	}
+
+	var amountStr string
+	for _, re := range amountPatterns {
+		m := re.FindStringSubmatch(text)
+		if len(m) > 1 {
+			amountStr = m[1]
+			break
+		}
+	}
+
+	// 兜底：取最后一个独立数字
+	if amountStr == "" {
+		re := regexp.MustCompile(`(\d+\.?\d*)`)
+		matches := re.FindAllStringSubmatch(text, -1)
+		if len(matches) > 0 {
+			amountStr = matches[len(matches)-1][1]
+		}
+	}
+
+	if amountStr == "" {
+		return 0, ""
+	}
+
+	amountFloat, err := strconv.ParseFloat(amountStr, 64)
+	if err != nil || amountFloat <= 0 {
+		return 0, ""
+	}
+
+	// 转为分
+	amountCents := int64(math.Round(amountFloat * 100))
+
+	// 2. 提取分类（Jieba 分词 + 数据库匹配）
+	words := s.jieba.Cut(text, true)
+	category := "其他"
+
+	for _, word := range words {
+		var ck models.CategoryKeyword
+		if err := s.db.Where("keyword = ?", word).First(&ck).Error; err == nil {
+			category = ck.Category
+			break
+		}
+	}
+
+	return amountCents, category
+}
+
+// AddTransaction 解析文本并创建一条交易记录
+func (s *FinanceService) AddTransaction(userID int64, text string) (int64, string, error) {
+	amount, category := s.ParseText(text)
+	if amount == 0 {
+		return 0, "", nil
+	}
+
+	tx := models.Transaction{
+		UserID:   userID,
+		Amount:   amount,
+		Category: category,
+		Note:     text,
+		Date:     time.Now().Format("2006-01-02"),
+	}
+
+	return amount, category, s.db.Create(&tx).Error
+}
+
+// GetTransactions 获取用户的交易记录
+func (s *FinanceService) GetTransactions(userID int64, limit int) ([]models.Transaction, error) {
+	var items []models.Transaction
+	err := s.db.Where("user_id = ? AND is_deleted = ?", userID, false).
+		Order("id desc").Limit(limit).Find(&items).Error
+	return items, err
+}
+
+// GetTransactionsByDate 获取用户指定日期的交易记录
+func (s *FinanceService) GetTransactionsByDate(userID int64, date string) ([]models.Transaction, error) {
+	var items []models.Transaction
+	err := s.db.Where("user_id = ? AND date = ? AND is_deleted = ?", userID, date, false).
+		Order("id desc").Find(&items).Error
+	return items, err
+}