docs(i18n): add AI game showcase section and sync all 9 languages

- Add section 3.4 with 8 real-world AI-coded game cases (WotAI Games, Blooming Garden, Planet Jumper, 100 browser games, CraftMine, AI Mario, Kimi K3, K399) plus 13 screenshots
- Add Kimi Code row to the AI tool table, trim section 3.2 to 8 AI-native mechanics, convert 3.3 code blocks to prompt-style lists
- Upgrade es-es and vi-vn from simplified to full versions

Author: sanbuphy

docs/ar-sa/stage-1/ai-capabilities-through-games/index.md

@@ -2219,7 +2219,7 @@
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@@ -2299,7 +2299,7 @@
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