Add PCD @ Seoul 2026 to the PCD map

[github-actions]

Note

The Plus Code was auto-recovered from the user's input (HW2V+H6 Seoul) using the city as a reference. Please verify the map pin placement is correct (https://plus.codes/8Q98HW2V+H6).

Closes #42

This PR was generated from the "New Event" issue form for PCD @ Seoul 2026.
Submitted by @showyourmindlab.

Review checklist:

• Event name "PCD @ Seoul 2026" is correct
• Public name "Jusub Kim" and email "showyourmind@gmail.com" are correct
• Short description is left blank — confirm this is intentional
• Date is marked TBD — confirm this is intentional
• Location is marked TBD — confirm this is intentional
• Check the map and event details page in the Netlify preview (link posted below by the Netlify bot)

[netlify]

✅ Deploy Preview for processing-community-day ready!

Name	Link
🔨 Latest commit	8c12ab5
🔍 Latest deploy log	https://app.netlify.com/projects/processing-community-day/deploys/69bcb399922d2b0008d2a95f
😎 Deploy Preview	https://deploy-preview-43--processing-community-day.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.