feat: 新增预警与附件模块，优化工位派工功能

1. 新增预警规则、预警消息、业务附件数据库表与CRUD逻辑
2. 为拧紧记录添加审核人、审核时间字段及审核留痕功能
3. 优化产线点位类型与编号描述，更新工位组合下发菜单名称为工艺路线派工
4. 新增上传文件获取原文件名与大小的工具方法
5. 在系统管理菜单新增预警中心与附件中心入口

bj_power_mes/internal/handler/attachment.go

@@ -0,0 +1,84 @@
+package handler
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"bj_power_mes/common/httpx"
+	"bj_power_mes/internal/logic"
+	"bj_power_mes/internal/svc"
+)
+
+// AttachmentUploadHandler POST /attachment/upload 上传并登记（multipart: bizType,bizId,file）
+func AttachmentUploadHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if err := r.ParseMultipartForm(32 << 20); err != nil {
+			httpx.BadRequest(w, "表单解析失败")
+			return
+		}
+		bizType := r.FormValue("bizType")
+		bizId := r.FormValue("bizId")
+		if bizType == "" || bizId == "" {
+			httpx.BadRequest(w, "bizType 与 bizId 必填")
+			return
+		}
+		rel, fname, size, err := saveUploadFileFull(r, "file", svcCtx.Config.Upload.Dir)
+		if err != nil {
+			httpx.Fail(w, 3311, "文件保存失败："+err.Error())
+			return
+		}
+		rec, err := logic.New(svcCtx).AddAttachment(r.Context(), bizType, bizId, fname, rel, int(size), operator(r, ""))
+		if err != nil {
+			httpx.Fail(w, 3311, err.Error())
+			return
+		}
+		httpx.Ok(w, rec)
+	}
+}
+
+// AttachmentListHandler GET /attachments?bizType=&bizId= 附件列表
+func AttachmentListHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		q := r.URL.Query()
+		data, err := logic.New(svcCtx).ListAttachments(r.Context(), q.Get("bizType"), q.Get("bizId"))
+		if err != nil {
+			httpx.Fail(w, 3312, err.Error())
+			return
+		}
+		httpx.Ok(w, data)
+	}
+}
+
+// AttachmentDownloadHandler GET /attachment/download?name= 下载
+func AttachmentDownloadHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		name := r.URL.Query().Get("name")
+		if name == "" {
+			httpx.BadRequest(w, "缺少 name")
+			return
+		}
+		serveUploadFile(w, r, svcCtx.Config.Upload.Dir, name)
+	}
+}
+
+// AttachmentDeleteHandler POST /attachment/delete {id} 删除（记录+物理文件）
+func AttachmentDeleteHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req struct {
+			Id int `json:"id"`
+		}
+		if err := httpx.ParseJSON(r, &req); err != nil {
+			httpx.BadRequest(w, "请求体解析失败")
+			return
+		}
+		att, err := logic.New(svcCtx).DeleteAttachment(r.Context(), req.Id)
+		if err != nil {
+			httpx.Fail(w, 3313, err.Error())
+			return
+		}
+		full := filepath.Join(svcCtx.Config.Upload.Dir, filepath.FromSlash(att.FilePath))
+		_ = os.Remove(full)
+		httpx.OkMessage(w, "删除成功", nil)
+	}
+}