feat: 同步视觉风格与主体身份母版工作区

对齐后端 dev 059e597，新增项目风格编辑锁定、身份文本生成、身份参考图与母版切换。
整理六个工作区入口，接通人物及场景母版继承说明、形态图片来源追溯。
补充草稿保护、正式 ID 校验、费用确认及部分失败回执，67 项测试和静态检查、构建通过。
未修改后端，未调用真实模型；本环境未完成浏览器视觉验收。

src/features/projects/ProjectLayout.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { computed, provide } from 'vue'
 import { useRoute } from 'vue-router'
-import { ArrowLeft, RefreshCw, FileText, Layers, Camera, Images, LoaderCircle } from '@lucide/vue'
+import { ArrowLeft, RefreshCw, FileText, Layers, Camera, Images, Palette, Fingerprint, LoaderCircle } from '@lucide/vue'
 import { StatusBadge } from '../../components/ui'
 import { projectContextKey, useProjectData } from './context'
 import { getOperation } from '../workflows/operations'
@@ -39,18 +39,12 @@ const operation = computed(() => getOperation(id.value))
             </div>
         </div>
         <nav class="workflow-nav" aria-label="项目工作流">
-            <RouterLink :to="`/projects/${id}/create-drama`"
-                ><FileText :size="17" />剧本创作<span class="nav-code">create-drama</span></RouterLink
-            >
-            <RouterLink :to="`/projects/${id}/breakdown`"
-                ><Layers :size="17" />剧本拆解<span class="nav-code">breakdown</span></RouterLink
-            >
-            <RouterLink :to="`/projects/${id}/subject-images`"
-                ><Images :size="17" />形态图片<span class="nav-code">subject-image</span></RouterLink
-            >
-            <RouterLink :to="`/projects/${id}/storyboard`"
-                ><Camera :size="17" />分镜设计<span class="nav-code">storyboard</span></RouterLink
-            >
+            <RouterLink :to="`/projects/${id}/create-drama`"><FileText :size="17" />剧本创作</RouterLink>
+            <RouterLink :to="`/projects/${id}/breakdown`"><Layers :size="17" />剧本拆解</RouterLink>
+            <RouterLink :to="`/projects/${id}/visual-style`"><Palette :size="17" />视觉风格</RouterLink>
+            <RouterLink :to="`/projects/${id}/subject-identity`"><Fingerprint :size="17" />主体身份</RouterLink>
+            <RouterLink :to="`/projects/${id}/subject-images`"><Images :size="17" />形态图片</RouterLink>
+            <RouterLink :to="`/projects/${id}/storyboard`"><Camera :size="17" />分镜设计</RouterLink>
         </nav>
         <p v-if="context.error.value" class="alert alert-error mt-4" role="alert">
             {{ context.error.value }}<span v-if="context.project.value"> 当前保留上次成功读取的数据。</span>