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/web/server.go

@@ -0,0 +1,116 @@
+package web
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"xiaji-go/models"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+type WebServer struct {
+	db       *gorm.DB
+	port     int
+	username string
+	password string
+}
+
+func NewWebServer(db *gorm.DB, port int, username, password string) *WebServer {
+	return &WebServer{db: db, port: port, username: username, password: password}
+}
+
+func (s *WebServer) Start() {
+	gin.SetMode(gin.ReleaseMode)
+	r := gin.Default()
+	r.LoadHTMLGlob("templates/*")
+
+	// 页面
+	r.GET("/", s.handleIndex)
+	r.GET("/api/records", s.handleRecords)
+	r.POST("/delete/:id", s.handleDelete)
+	r.GET("/export", s.handleExport)
+
+	// 健康检查
+	r.GET("/health", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{"status": "ok"})
+	})
+
+	logAddr := fmt.Sprintf(":%d", s.port)
+	fmt.Printf("🌐 Web后台运行在 http://127.0.0.1%s\n", logAddr)
+	if err := r.Run(logAddr); err != nil {
+		fmt.Printf("❌ Web服务启动失败: %v\n", err)
+	}
+}
+
+func (s *WebServer) handleIndex(c *gin.Context) {
+	c.HTML(http.StatusOK, "index.html", nil)
+}
+
+func (s *WebServer) handleRecords(c *gin.Context) {
+	var items []models.Transaction
+	s.db.Where("is_deleted = ?", false).Order("id desc").Limit(50).Find(&items)
+
+	type txResponse struct {
+		ID       uint    `json:"id"`
+		UserID   int64   `json:"user_id"`
+		Amount   float64 `json:"amount"`
+		Category string  `json:"category"`
+		Note     string  `json:"note"`
+		Date     string  `json:"date"`
+	}
+
+	resp := make([]txResponse, len(items))
+	for i, item := range items {
+		resp[i] = txResponse{
+			ID:       item.ID,
+			UserID:   item.UserID,
+			Amount:   item.AmountYuan(),
+			Category: item.Category,
+			Note:     item.Note,
+			Date:     item.Date,
+		}
+	}
+
+	c.JSON(http.StatusOK, resp)
+}
+
+func (s *WebServer) handleDelete(c *gin.Context) {
+	idStr := c.Param("id")
+	id, err := strconv.ParseUint(idStr, 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的ID"})
+		return
+	}
+
+	result := s.db.Model(&models.Transaction{}).Where("id = ? AND is_deleted = ?", id, false).Update("is_deleted", true)
+	if result.Error != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "删除失败"})
+		return
+	}
+	if result.RowsAffected == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "记录不存在或已删除"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"status": "success"})
+}
+
+func (s *WebServer) handleExport(c *gin.Context) {
+	var items []models.Transaction
+	s.db.Where("is_deleted = ?", false).Order("date asc, id asc").Find(&items)
+
+	c.Header("Content-Type", "text/csv; charset=utf-8")
+	c.Header("Content-Disposition", "attachment; filename=transactions.csv")
+
+	// BOM for Excel
+	c.Writer.Write([]byte{0xEF, 0xBB, 0xBF})
+	c.Writer.WriteString("ID,日期,分类,金额(元),备注\n")
+
+	for _, item := range items {
+		line := fmt.Sprintf("%d,%s,%s,%.2f,\"%s\"\n", item.ID, item.Date, item.Category, item.AmountYuan(), item.Note)
+		c.Writer.WriteString(line)
+	}
+}