feat: restructure gen2D deck with enriched content and frankfurt theme components

- Restructure from 12 slides to 21 slides with proper section navigation
- Split into pages/ for modular maintenance (15 page files)
- Use frankfurt theme: cover layout, Item component, section frontmatter
- Remove all two-cols layouts to avoid rendering issues
- Add rich content from tmp/ docs: Eino pipeline, prompt agent, async tasks, data model, deployment
- Use Item component for structured content blocks
- Add mermaid ER diagram for data model
- Add Go code block for pipeline type definitions

decks/gen2D/pages/eino-graph.md

@@ -0,0 +1,47 @@
+# Eino 管线编排 — compose.Graph
+
+四阶段智能体协作的核心实现
+
+<div class="mt-2">
+
+```go {all|1-8|10-15|17-22|24-28}
+// 类型定义
+type PipelineInput struct {
+    UserID     string
+    ProjectID  string
+    TaskID     string
+    Prompt     string
+    AssetType  string
+    StyleMap   map[string]string
+}
+
+type PipelineState struct {
+    OptimizedPrompt string
+    ImageURL        string
+    QualityPassed   bool
+    RetryCount      int
+}
+
+type PipelineOutput struct {
+    AssetURL string
+    Metadata map[string]any
+}
+```
+
+</div>
+
+<v-clicks>
+
+<Item title="graph.Build() — 构建管线">
+使用 `compose.NewGraph[PipelineInput, PipelineOutput]()` 创建有向图，依次注册四个节点：PromptOptimizer → AssetGenerator → QualitySupervisor → FormatAdapter。质检节点支持条件分支：通过则进入格式适配，不通过则回退到提示词优化。
+</Item>
+
+<Item title="stateHandler — 状态管理">
+通过 `AddLambda` 注册状态处理器，在节点间传递优化后的提示词、图片 URL、重试计数等状态。质检节点根据 `RetryCount` 决定重优化还是降级输出。
+</Item>
+
+<Item title="graph.Invoke() — 执行管线">
+传入 `PipelineInput`，管线自动按拓扑顺序执行各节点。每个节点执行完成后通过回调更新进度（5% → 25% → 60% → 80% → 100%）。
+</Item>
+
+</v-clicks>