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-deep-dive.md

@@ -0,0 +1,76 @@
+# Eino Graph 深入 — 构建与编排
+
+有向图构建与本地状态管理
+
+<div class="mt-2">
+
+```go {1-5|7-11|all}
+g := compose.NewGraph[PipelineInput, PipelineOutput](
+    compose.WithGenLocalState(func(ctx context.Context) *PipelineState {
+        return &PipelineState{}  // 每次调用获得全新状态
+    }),
+)
+
+g.AddLambdaNode(nodePromptOptimizer, &compose.Lambda{
+    StatePreHandler:  preparePromptInput,   // 从 state 读取输入
+    StatePostHandler: storePromptOutput,    // 结果写回 state
+})
+```
+
+</div>
+
+<v-clicks>
+
+<Item title="WithGenLocalState — 隔离的执行上下文">
+每次 `graph.Invoke()` 调用生成独立的 `PipelineState`，避免并发调用间的状态污染。State 在节点间通过 Pre/Post Handler 流转。
+</Item>
+
+<Item title="StatePreHandler / StatePostHandler 模式">
+PreHandler 从全局 State 提取当前节点所需字段；PostHandler 将节点输出写回 State。节点本身无状态，所有数据经 State 中转。
+</Item>
+
+</v-clicks>
+
+---
+
+# Eino Graph 深入 — 分支路由与重试
+
+QualitySupervisor 驱动的条件分支
+
+<div class="mt-2">
+
+```go {1-10|all}
+g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
+    func(ctx context.Context, _ PipelineInput) (string, error) {
+        var next string
+        _ = compose.ProcessState[*PipelineState](ctx,
+            func(_ context.Context, state *PipelineState) error {
+                next = state.NextNode  // 质检结果决定路由
+                return nil
+            })
+        return next, nil
+    },
+    map[string]bool{
+        nodePromptOptimizer: true,
+        nodeFormatAdapter:   true,
+    },
+))
+```
+
+</div>
+
+<v-clicks>
+
+<Item title="路由逻辑">
+质检通过 → FormatAdapter 直接输出；不通过且 retry < 3 → PromptOptimizer 重新优化；不通过且 retry >= 3 → FormatAdapter 降级输出。
+</Item>
+
+<Item title="管线全貌">
+下图展示了完整的分支路由与重试机制，包括状态流转和降级路径。
+</Item>
+
+</v-clicks>
+
+<div class="flex justify-center mt-2">
+  <img src="../public/pipeline-detail.svg" class="w-full max-h-[200px] object-contain" />
+</div>