feat: expand gen2D deck with deep technical slides and interactive elements

- Add 5 new slide pages: eino-deep-dive, ratelimit-overview, ratelimit-lua, async-deep-dive, harness
- Add 4 new drawio SVGs: pipeline-detail, ratelimit, async-task, harness
- Update all existing slides with v-clicks progressive reveal
- Add presenter notes and interactive prompts
- Expand slides.md to register all new pages (16 → 25+ slides)
- Fix text overflow by trimming content per Item block
- Add Eino Graph deep dive: WithGenLocalState, Pre/Post Handler, branch routing
- Add rate limiting section: algorithm comparison, Lua script, Gin middleware
- Add async task deep dive: TaskQueue FIFO, context progress injection
- Add consistency section: style/pipeline/data/deployment 4-layer guarantees

decks/gen2D/slides.md

@@ -22,6 +22,11 @@ AI 驱动的 2D 游戏素材生成工具
   <b>赛道</b>：七牛云 XEngineer 暑期实训营
 </div>
 
+<!--
+大家好，我是栈无不胜。今天给大家分享我们的项目 gen2D —— 一个 AI 驱动的 2D 游戏素材生成工具。
+接下来我会从痛点、方案、技术实现三个维度来展开。
+-->
+
 ---
 src: ./pages/problem.md
 ---
@@ -53,23 +58,43 @@ src: ./pages/tech-stack.md
 ---
 
 ---
-section: '核心实现'
+section: '核心实现 — Eino 管线'
 src: ./pages/eino-graph.md
 ---
 
 ---
+src: ./pages/eino-deep-dive.md
+---
+
+---
+section: '核心实现 — 提示词优化'
 src: ./pages/prompt-agent.md
 ---
 
 ---
+section: '核心实现 — 异步任务'
 src: ./pages/async-task.md
 ---
 
+---
+src: ./pages/async-deep-dive.md
+---
+
 ---
 src: ./pages/dedup-ws.md
 ---
 
 ---
+section: '核心实现 — 分布式限流'
+src: ./pages/ratelimit-overview.md
+---
+
+---
+src: ./pages/ratelimit-lua.md
+---
+
+---
+section: '数据与部署'
 src: ./pages/data-model.md
 ---
 
@@ -77,6 +102,11 @@ src: ./pages/data-model.md
 src: ./pages/deployment.md
 ---
 
+---
+section: '一致性保障'
+src: ./pages/harness.md
+---
+
 ---
 section: '总结'
 src: ./pages/highlights.md