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/architecture.md

@@ -1,7 +1,7 @@
 # 系统架构全景
 
-<div class="mt-2 flex justify-center">
-  <img src="../public/architecture.svg" class="w-full max-h-[450px] object-contain" />
+<div class="flex justify-center">
+  <img src="../public/architecture.svg" class="w-full max-h-[480px] object-contain" />
 </div>
 
 <!--