refactor: 重构项目结构

- 将 Python 代码移至 analyzer/ 目录（含 venv）
- 拆分 Go 服务器代码为模块化结构:
  - config/: 配置加载
  - model/: 请求/响应模型
  - service/: 业务逻辑
  - handler/: API处理器
- 添加 .gitignore 文件
- 删除旧的独立脚本文件

server/handler/review.go

@@ -0,0 +1,72 @@
+package handler
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"billai-server/config"
+	"billai-server/model"
+	"billai-server/service"
+)
+
+// Review 获取需要复核的记录
+func Review(c *gin.Context) {
+	// 获取文件名参数
+	fileName := c.Query("file")
+	if fileName == "" {
+		c.JSON(http.StatusBadRequest, model.ReviewResponse{
+			Result:  false,
+			Message: "请提供文件名参数 (file)",
+		})
+		return
+	}
+
+	// 构建文件路径
+	outputDirAbs := config.ResolvePath(config.Global.OutputDir)
+	filePath := filepath.Join(outputDirAbs, fileName)
+
+	// 检查文件是否存在
+	if _, err := os.Stat(filePath); os.IsNotExist(err) {
+		c.JSON(http.StatusNotFound, model.ReviewResponse{
+			Result:  false,
+			Message: "文件不存在: " + fileName,
+		})
+		return
+	}
+
+	// 判断文件格式
+	format := "csv"
+	if strings.HasSuffix(fileName, ".json") {
+		format = "json"
+	}
+
+	// 提取需要复核的记录
+	records := service.ExtractNeedsReview(filePath, format)
+
+	// 统计高低优先级数量
+	highCount := 0
+	lowCount := 0
+	for _, r := range records {
+		if r.ReviewLevel == "HIGH" {
+			highCount++
+		} else if r.ReviewLevel == "LOW" {
+			lowCount++
+		}
+	}
+
+	c.JSON(http.StatusOK, model.ReviewResponse{
+		Result:  true,
+		Message: "获取成功",
+		Data: &model.ReviewData{
+			Total:   len(records),
+			High:    highCount,
+			Low:     lowCount,
+			Records: records,
+		},
+	})
+}
+

server/handler/upload.go

@@ -0,0 +1,119 @@
+package handler
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"billai-server/config"
+	"billai-server/model"
+)
+
+// Upload 处理账单上传和清理请求
+func Upload(c *gin.Context) {
+	// 1. 获取上传的文件
+	file, header, err := c.Request.FormFile("file")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, model.UploadResponse{
+			Result:  false,
+			Message: "请上传账单文件 (参数名: file)",
+		})
+		return
+	}
+	defer file.Close()
+
+	// 2. 解析请求参数
+	var req model.UploadRequest
+	c.ShouldBind(&req)
+	if req.Format == "" {
+		req.Format = "csv"
+	}
+
+	// 3. 保存上传的文件
+	timestamp := time.Now().Format("20060102_150405")
+	inputFileName := fmt.Sprintf("%s_%s", timestamp, header.Filename)
+	uploadDirAbs := config.ResolvePath(config.Global.UploadDir)
+	inputPath := filepath.Join(uploadDirAbs, inputFileName)
+
+	dst, err := os.Create(inputPath)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, model.UploadResponse{
+			Result:  false,
+			Message: "保存文件失败: " + err.Error(),
+		})
+		return
+	}
+	defer dst.Close()
+	io.Copy(dst, file)
+
+	// 4. 构建输出文件路径
+	baseName := strings.TrimSuffix(header.Filename, filepath.Ext(header.Filename))
+	outputExt := ".csv"
+	if req.Format == "json" {
+		outputExt = ".json"
+	}
+	outputFileName := fmt.Sprintf("%s_%s_cleaned%s", timestamp, baseName, outputExt)
+	outputDirAbs := config.ResolvePath(config.Global.OutputDir)
+	outputPath := filepath.Join(outputDirAbs, outputFileName)
+
+	// 5. 构建命令参数
+	cleanScriptAbs := config.ResolvePath(config.Global.CleanScript)
+	args := []string{cleanScriptAbs, inputPath, outputPath}
+	if req.Year != "" {
+		args = append(args, "--year", req.Year)
+	}
+	if req.Month != "" {
+		args = append(args, "--month", req.Month)
+	}
+	if req.Start != "" {
+		args = append(args, "--start", req.Start)
+	}
+	if req.End != "" {
+		args = append(args, "--end", req.End)
+	}
+	if req.Format != "" {
+		args = append(args, "--format", req.Format)
+	}
+
+	// 6. 执行 Python 脚本
+	pythonPathAbs := config.ResolvePath(config.Global.PythonPath)
+	cmd := exec.Command(pythonPathAbs, args...)
+	cmd.Dir = config.Global.ProjectRoot
+	output, err := cmd.CombinedOutput()
+	outputStr := string(output)
+
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, model.UploadResponse{
+			Result:  false,
+			Message: "处理失败: " + err.Error(),
+		})
+		return
+	}
+
+	// 7. 检测账单类型
+	billType := ""
+	if strings.Contains(outputStr, "支付宝") {
+		billType = "alipay"
+	} else if strings.Contains(outputStr, "微信") {
+		billType = "wechat"
+	}
+
+	// 8. 返回成功响应
+	c.JSON(http.StatusOK, model.UploadResponse{
+		Result:  true,
+		Message: "处理成功",
+		Data: &model.UploadData{
+			BillType: billType,
+			FileURL:  fmt.Sprintf("/download/%s", outputFileName),
+			FileName: outputFileName,
+		},
+	})
+}
+