style: optimize gen2D deck layout, animations, and visual hierarchy

- style-keys.md: add v-clicks to 3x2 grid for staggered animation
- eino-graph.md: two-column layout (code left, Items right)
- eino-deep-dive.md: two-column layout for both slides, code+Items side-by-side
- async-deep-dive.md: two-column layout for both slides, SVG integrated
- harness.md: two-column layout for slide 1 (code left, Items right)
- request-journey.md: two-column layout for journey steps
- data-model.md: add v-clicks to grid items, increase diagram height
- architecture/pipeline/prompt-agent: increase SVG max-height for better visibility

decks/gen2D/pages/data-model.md

@@ -3,11 +3,13 @@
 四表结构，清晰的实体关系
 
 <div class="flex justify-center">
-  <img src="../public/data-model.svg" class="w-full max-h-[220px] object-contain" />
+  <img src="../public/data-model.svg" class="w-full max-h-[240px] object-contain" />
 </div>
 
 <div class="grid grid-cols-2 gap-4 mt-2">
 
+<v-clicks>
+
 <Item title="👤 USER + PROJECT">
 用户：`id`(base62)、`username`、`password_hash`(bcrypt)
 工程：`id`、`user_id`、`name`
@@ -19,4 +21,6 @@
 素材：`file_url`、`metadata`
 </Item>
 
+</v-clicks>
+
 </div>