fix: use relative path for ogImage — Astro asset pipeline requires src/assets reference

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lufftw

site/src/data/blog/eventgo-taiwan-event-discovery-platform.md

@@ -15,7 +15,7 @@ tags:
   - things to do in Taiwan
   - weekend plans
 description: "EventGo (eventgo.tw) is a free event discovery platform for Taiwan — find concerts, exhibitions, markets, and festivals with AI-powered search, calendar view, and smart recommendations."
-ogImage: /assets/images/eventgo/og-cover.png
+ogImage: ../../assets/images/eventgo/og-cover.png
 ---
 
 > *"Every weekend in Taiwan, thousands of events bloom across the island — you just need one place to find them all."*

site/src/data/blog/eventgo-tw-taiwan-event-platform-zh.md

@@ -15,7 +15,7 @@ tags:
   - 週末活動
   - 活動推薦
 description: "EventGo (eventgo.tw) 是一個免費的台灣活動探索平台——用 AI 智慧搜尋找到演唱會、展覽、市集、祭典，支援日曆瀏覽和聊天推薦，再也不錯過精彩活動。"
-ogImage: /assets/images/eventgo/og-cover.png
+ogImage: ../../assets/images/eventgo/og-cover.png
 ---
 
 > *「台灣每個週末都有上千場活動在各個角落綻放——你只需要一個地方，就能全部找到。」*