修复(权限管理)：统一 PM 系统导航与权限校验

frontend/src/views/DesktopProjectEntry.vue

@@ -32,20 +32,22 @@
         </div>
       </div>
 
-      <!-- 管理后台控制卡片 - 常驻左侧底部 -->
-      <div v-if="isAdmin" class="sidebar-admin">
-        <button class="admin-action-card" type="button" @click="enterAdmin">
+      <!-- ADMIN / PM 可进入系统管理，其他角色仅可选择项目 -->
+      <div v-if="canEnterManagement" class="sidebar-admin">
+        <button class="admin-action-card" type="button" @click="enterManagement">
           <span class="admin-glow-layer" aria-hidden="true"></span>
           <div class="admin-card-head">
             <div class="admin-icon-box">
               <el-icon><Monitor /></el-icon>
             </div>
             <div class="admin-text-box">
-              <span class="admin-kicker">ADMIN SYSTEM</span>
-              <strong>管理后台</strong>
+              <span class="admin-kicker">{{ isAdmin ? "ADMIN SYSTEM" : "SYSTEM MANAGEMENT" }}</span>
+              <strong>系统管理</strong>
             </div>
           </div>
-          <p class="admin-desc">人员账号管理、项目授权、审计及系统配置</p>
+          <p class="admin-desc">
+            {{ isAdmin ? "人员账号管理、项目授权、审计及系统配置" : "查看并维护您负责项目的授权与范围配置" }}
+          </p>
           <div class="admin-foot">
             <span>进入控制台</span>
             <el-icon><ArrowRight /></el-icon>
@@ -170,13 +172,16 @@ const loading = ref(false);
 const loggingOut = ref(false);
 const isTransitioning = ref(false);
 const isAdmin = computed(() => isSystemAdmin(auth.user));
+const canEnterManagement = computed(() =>
+  isAdmin.value || projects.value.some((project) => project.role_in_study === "PM"),
+);
 
 const userDisplayName = computed(
   () => auth.user?.full_name || auth.user?.username || auth.user?.email || TEXT.common.labels.userFallback,
 );
 const userInitial = computed(() => userDisplayName.value.charAt(0).toUpperCase() || TEXT.common.labels.userInitialFallback);
 const entrySubtitle = computed(() =>
-  isAdmin.value ? "进入管理后台，或选择一个项目开始桌面工作。" : "请选择本次要进入的项目。",
+  canEnterManagement.value ? "进入系统管理，或选择一个项目开始桌面工作。" : "请选择本次要进入的项目。",
 );
 
 const statusLabel = (status: string | undefined) =>
@@ -194,12 +199,20 @@ const loadProjects = async () => {
   }
 };
 
-const enterAdmin = () => {
-  if (!isAdmin.value) return;
+const enterManagement = () => {
+  if (!canEnterManagement.value) return;
   isTransitioning.value = true;
-  window.setTimeout(() => {
-    studyStore.clearCurrentStudy();
-    router.push("/admin/users");
+  window.setTimeout(async () => {
+    if (isAdmin.value) {
+      studyStore.clearCurrentStudy();
+    } else {
+      const pmProject = projects.value.find((project) => project.role_in_study === "PM");
+      if (pmProject) {
+        studyStore.setCurrentStudy(pmProject);
+        await studyStore.loadCurrentStudyPermissions().catch(() => {});
+      }
+    }
+    await router.push(isAdmin.value ? "/admin/users" : "/admin/projects");
   }, 300);
 };
 
@@ -414,7 +427,7 @@ onMounted(() => {
   color: #ef4444;
 }
 
-/* 常驻管理后台卡片（精致浅色流光） */
+/* 常驻系统管理卡片（精致浅色流光） */
 .sidebar-admin {
   width: 100%;
 }