fix: split overflowing slides to fit frankfurt theme header/footer bars

- eino-deep-dive.md: split slide 2 into code-only + explanation+SVG slides
- async-deep-dive.md: split slide 2 into code-only + progress+SVG slides
- harness.md: split slide 2 (4 Items + SVG) into two slides (2 Items each)
- request-journey.md: split into middleware/handler + pipeline/finalization slides

The frankfurt theme header (~40px) overlaps ~7px into the content zone,
leaving ~467px effective height. Dense slides with code+Items+images
exceeded this budget and were hidden behind the bars.

decks/gen2D/pages/async-deep-dive.md

@@ -48,10 +48,6 @@ func (q *TaskQueue) Enqueue(job *TaskJob) {
 
 Context 注入 + 多通道推送
 
-<div class="grid grid-cols-2 gap-4 mt-2">
-
-<div>
-
 ```go {1-3|5-8|all}
 func WithProgressReporter(ctx context.Context, r ProgressReporter) context.Context {
     return context.WithValue(ctx, progressCtxKey, r)
@@ -62,13 +58,9 @@ reporter := GetProgressReporter(ctx)
 reporter.Report(Progress{Stage: "prompt", Percent: 25})
 ```
 
-<div class="flex justify-center mt-2">
-  <img src="../public/async-task.svg" class="w-full max-h-[160px] object-contain" />
-</div>
+---
 
-</div>
-
-<div class="flex flex-col justify-center">
+# 进度推送 — 阶段与通道
 
 <v-clicks>
 
@@ -82,6 +74,6 @@ reporter.Report(Progress{Stage: "prompt", Percent: 25})
 
 </v-clicks>
 
-</div>
-
+<div class="flex justify-center mt-2">
+  <img src="../public/async-task.svg" class="w-full max-h-[200px] object-contain" />
 </div>

decks/gen2D/pages/eino-deep-dive.md

@@ -45,10 +45,6 @@ PreHandler 从全局 State 提取当前节点所需字段；PostHandler 将节
 
 QualitySupervisor 驱动的条件分支
 
-<div class="grid grid-cols-2 gap-4 mt-2">
-
-<div>
-
 ```go {1-10|all}
 g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
     func(ctx context.Context, _ PipelineInput) (string, error) {
@@ -67,9 +63,9 @@ g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
 ))
 ```
 
-</div>
+---
 
-<div class="flex flex-col justify-center">
+# 分支路由 — 逻辑与全貌
 
 <v-clicks>
 
@@ -84,9 +80,5 @@ g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
 </v-clicks>
 
 <div class="flex justify-center mt-2">
-  <img src="../public/pipeline-detail.svg" class="w-full max-h-[160px] object-contain" />
-</div>
-
-</div>
-
+  <img src="../public/pipeline-detail.svg" class="w-full max-h-[200px] object-contain" />
 </div>

decks/gen2D/pages/harness.md

@@ -41,9 +41,9 @@ QualitySupervisor 自动质检，不合格重试（最多 3 次），超限降
 
 ---
 
-# 一致性保障 — 数据与部署
+# 一致性保障 — 数据与 ID
 
-从存储到部署的全链路一致性
+存储层的一致性设计
 
 <v-clicks>
 
@@ -55,6 +55,16 @@ SQLite 单文件 ACID + GORM 事务包裹关键操作。CASCADE 删除保证级
 格式：`prefix_base62`（如 `task_9bN4vR`）。`crypto/rand` 生成 base62 编码，全局唯一且可读。前缀标识实体类型，便于调试。
 </Item>
 
+</v-clicks>
+
+---
+
+# 一致性保障 — 部署与配置
+
+从容器到配置的全链路一致性
+
+<v-clicks>
+
 <Item title="部署一致性 — 容器化 + 确定性构建">
 Docker Compose 双容器（nginx + app），确定性构建保证环境一致。CI/CD 推送 master 自动触发部署。
 </Item>
@@ -66,5 +76,5 @@ Docker Compose 双容器（nginx + app），确定性构建保证环境一致。
 </v-clicks>
 
 <div class="flex justify-center mt-2">
-  <img src="../public/harness.svg" class="w-full max-h-[160px] object-contain" />
+  <img src="../public/harness.svg" class="w-full max-h-[200px] object-contain" />
 </div>

decks/gen2D/pages/request-journey.md

@@ -10,10 +10,6 @@ POST /api/v1/generate  {prompt: "像素风骑士", assetType: "sprite", style: {
 
 </div>
 
-<div class="grid grid-cols-2 gap-4 mt-2">
-
-<div>
-
 <v-clicks>
 
 <Item title="① Middleware 层（~1ms）">
@@ -26,9 +22,11 @@ JWT 认证 → 解析 userID → 用户级限流（Redis Lua）→ 全局限流
 
 </v-clicks>
 
-</div>
+---
 
-<div>
+# 请求旅程 — 管线执行与收尾
+
+耗时集中在管线阶段（~30s 占 95%）
 
 <v-clicks>
 
@@ -42,11 +40,7 @@ goroutine 取任务 → PromptOptimizer → AssetGenerator → QualitySupervisor
 
 </v-clicks>
 
-</div>
-
-</div>
-
-<div v-click class="mt-2 text-center text-gray-400 text-sm">
+<div v-click class="mt-4 text-center text-gray-400 text-sm">
   全程异步：前端拿到 taskId 后通过 WebSocket 实时监听进度变化
 </div>