feat(msg): SSE 实时通知体系 (#1-#6) + dict 接口权限分层

- BizNotifyService 门面: 5 个语义方法 (expertAuditResult / planAuditResult /
  meetingInvitation / agreementAwaitingSign / projectAssignedToExecutor)
- #3 项目分配执行方: 跨调用对比旧 (sessions, amount) 差集去重
- #5 会议邀请: BizMeetingController.add 全量通知, edit 走 userIds 差集去重
- #6 协议待签: updateLaborProtocol 仅在旧 URL 空 → 新 URL 非空时推
- 前端: AdminLayout 全局 bell 角标 + 全局事件总线, doctor/Home 实时刷新,
  Messages 全部已读, Login.vue 角色统一跳首页, Toast 弹窗上移到 layout
- dict 权限分层 (读开放 / 写 admin-only): BizDictController + SysDictDataController
  避免 dropdown 403, 但写操作仍需 admin 防止误删

ry-api/ruoyi-admin/src/main/java/com/ruoyi/web/controller/system/SysDictDataController.java

@@ -40,7 +40,6 @@ public class SysDictDataController extends BaseController
     @Autowired
     private ISysDictTypeService dictTypeService;
 
-    @PreAuthorize("@ss.hasPermi('system:dict:list')")
     @GetMapping("/list")
     public TableDataInfo list(SysDictData dictData)
     {
@@ -50,7 +49,6 @@ public class SysDictDataController extends BaseController
     }
 
     @Log(title = "字典数据", businessType = BusinessType.EXPORT)
-    @PreAuthorize("@ss.hasPermi('system:dict:export')")
     @PostMapping("/export")
     public void export(HttpServletResponse response, SysDictData dictData)
     {
@@ -62,7 +60,6 @@ public class SysDictDataController extends BaseController
     /**
      * 查询字典数据详细
      */
-    @PreAuthorize("@ss.hasPermi('system:dict:query')")
     @GetMapping(value = "/{dictCode}")
     public AjaxResult getInfo(@PathVariable Long dictCode)
     {