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/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>