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/pages/problem.md

@@ -1,7 +1,9 @@
 # 痛点：2D 游戏素材制作
 
+<v-clicks>
+
 <Item title="🎨 美术成本高">
-专业美术人员费用高，独立开发者难以负担。外包单张 50-500 元，迭代周期长，试错成本高。
+专业美术费用高，独立开发者难以负担。外包单张 50-500 元，迭代周期长。
 </Item>
 
 <Item title="🔧 管线适配难">
@@ -9,9 +11,15 @@
 </Item>
 
 <Item title="🤖 现有 AI 工具的局限">
-通用文生图模型缺乏游戏素材领域知识，无法理解"像素风"等术语，输出不可控，无质检重试。
+通用文生图模型缺乏游戏素材领域知识，无法理解"像素风"等术语，输出不可控。
 </Item>
 
-<div class="mt-4 text-center text-gray-400">
+</v-clicks>
+
+<div v-click class="mt-4 text-center text-gray-400">
   <b>核心诉求</b>：低门槛 · 风格一致 · 管线友好 · 质量可控
 </div>
+
+<!--
+提问互动：在座各位有没有做过 2D 游戏？素材制作是不是最头疼的环节？
+-->