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/eino-graph.md

@@ -2,7 +2,7 @@
 
 <div class="mt-2">
 
-```go
+```go {all|1-4|6-10|all}
 type PipelineInput struct {
     UserID, ProjectID, TaskID string
     Prompt, AssetType         string
@@ -22,6 +22,8 @@ type PipelineOutput struct {
 
 </div>
 
+<v-clicks>
+
 <Item title="graph.Build() — 构建管线">
 `compose.NewGraph` 创建有向图，注册四节点。质检节点条件分支：通过 → 格式适配，不通过 → 回退提示词优化。
 </Item>
@@ -29,3 +31,5 @@ type PipelineOutput struct {
 <Item title="graph.Invoke() — 执行管线">
 传入 `PipelineInput`，按拓扑顺序执行。每节点完成回调更新进度（5% → 25% → 60% → 80% → 100%）。
 </Item>
+
+</v-clicks>