feat: 新增装机绑定功能与权限、BOM工序配置

1.  新增装机绑定实体与相关CRUD逻辑，支持工件工序物料绑定/解绑
2.  为BOM物料新增装配工序字段，支持按工序校验绑定
3.  扩展权限表，新增父权限码字段支持菜单按钮关联
4.  统一各页面帮助弹窗参数，新增角色管理帮助文档
5.  新增公共格式化工具函数，优化侧边栏菜单展开逻辑
6.  新增工位终端绑定代理接口与MES内部绑定API
7.  修复主入口数据库连接与schema初始化逻辑，新增一键迁移工具

bj_power_workstation/internal/handler/bind.go

@@ -0,0 +1,81 @@
+package handler
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"bj_power_workstation/internal/svc"
+)
+
+// bindPanelHandler 代理 MES GET /api/internal/workpiece/bind-panel?sn=&processCode=。
+// 工位终端扫码工件后拉取本工序应装/已装物料清单（装机绑定引导），响应原样透传。
+func bindPanelHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		sn := strings.TrimSpace(r.URL.Query().Get("sn"))
+		processCode := strings.TrimSpace(r.URL.Query().Get("processCode"))
+		if sn == "" || processCode == "" {
+			fail(w, http.StatusBadRequest, "缺少 sn / processCode 参数")
+			return
+		}
+		body, _, err := ctx.Mes.Get("/api/internal/workpiece/bind-panel",
+			url.Values{"sn": {sn}, "processCode": {processCode}})
+		if err != nil {
+			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
+			return
+		}
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(body)
+	}
+}
+
+// bindRecordHandler POST /api/bind/record —— 工位扫/录一个物料（SN/批次）→ MES 装机绑定。
+// 透传原 body，MES 负责校验（料是否属于本产品本工序 / 精密件SN防重 / 幂等）。
+func bindRecordHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		payload, err := io.ReadAll(r.Body)
+		if err != nil {
+			fail(w, http.StatusBadRequest, "请求体读取失败")
+			return
+		}
+		var probe struct {
+			Sn          string `json:"sn"`
+			ProcessCode int    `json:"processCode"`
+		}
+		_ = json.Unmarshal(payload, &probe)
+		if probe.Sn == "" || probe.ProcessCode <= 0 {
+			fail(w, http.StatusBadRequest, "sn / processCode 必填")
+			return
+		}
+		body, _, err := ctx.Mes.Post("/api/internal/workpiece/binds", json.RawMessage(payload))
+		if err != nil {
+			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
+			return
+		}
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(body)
+	}
+}
+
+// bindRemoveHandler POST /api/bind/remove —— 撤销误绑（未报工前）
+func bindRemoveHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		payload, err := io.ReadAll(r.Body)
+		if err != nil {
+			fail(w, http.StatusBadRequest, "请求体读取失败")
+			return
+		}
+		body, _, err := ctx.Mes.Post("/api/internal/workpiece/binds/remove", json.RawMessage(payload))
+		if err != nil {
+			fail(w, http.StatusBadGateway, "MES 服务不可达："+errString(err))
+			return
+		}
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(body)
+	}
+}