feat: 邮箱注册验证 + 9项功能修复与优化

【认证系统】
- 新增邮箱验证码注册/登录流程 (sendEmailCode / verifyEmail / forgotPassword / resetPassword)
- register-email 现在需要验证码
- 服务端新增 email_verification_codes 表 + patch-email-verification.js
- App.tsx 登录后 emailVerified 检查提醒
- keyServerClient token 显式传递修复 401 错误

【电商模块】
- 自动推进: 策划完成后自动生成分镜图/视频
- 模特图选项 (性别/年龄/种族/体型/场景) 注入 AI 提示词
- 任务持久化指纹修复 (图片数量替代 blob URL)
- 新增「视频换装」入口 (happyhorse-1.0-video-edit)

【剧本评分】
- 新增 .docx/.doc Word 文档支持 (ZIP解压+XML提取)
- 历史记录支持点击查看/恢复评测结果

【画布】
- ReactFlow 节点禁止内置拖拽避免冲突
- 连接线拖拽弹窗优化 (预览线不消失, 弹窗跟踪鼠标)

【页面修复】
- 首页轮播图改为 aspect-ratio: 16/9 解决尺寸问题
- 资产库新增悬停删除按钮
- scriptEvalClient 改用服务端 /api/ai/chat 端点
- TokenUsagePage 未登录跳过 API 调用

src/styles/themes/dark-green.css

@@ -3782,21 +3782,12 @@
 .web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new) > .project-card__empty--dark {
   display: grid;
   place-items: center;
-  background: #202020;
-  color: rgba(255, 255, 255, 0.22);
+  background: var(--bg-inset, transparent);
+  color: rgba(255, 255, 255, 0.14);
 }
 
 .web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new) > .project-card__empty--dark .anticon {
-  font-size: 34px;
-}
-
-.web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new)::after {
-  content: "";
-  grid-area: 1 / 1;
-  align-self: end;
-  height: 58%;
-  background: rgba(0, 0, 0, 0.86);
-  pointer-events: none;
+  font-size: 40px;
 }
 
 .web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new) .project-card__caption,
@@ -3812,18 +3803,35 @@
   padding-block: 0;
   background: none;
   color: rgba(255, 255, 255, 0.78);
+  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
+  opacity: 0;
+  transform: translateY(8px);
+  transition: opacity 220ms ease, transform 220ms ease;
+  pointer-events: none;
+}
+
+.web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new):hover .project-card__caption {
   opacity: 1;
-  transform: none;
+  transform: translateY(0);
 }
 
 .web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new) .project-card__meta {
   align-self: end;
   padding-block: 0 16px;
+  opacity: 0;
+  transform: translateY(8px);
+  transition: opacity 220ms ease, transform 220ms ease;
+}
+
+.web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new):hover .project-card__meta {
+  opacity: 1;
+  transform: translateY(0);
 }
 
 .web-shell[data-ui-theme="dark-green"] .community-page .project-card:not(.project-card--new) .project-card__meta strong {
   color: #fff;
   font-size: 15px;
+  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.72);
 }
 
 .web-shell[data-ui-theme="dark-green"] .community-filter-bar {