Fix mobile menu scroll-through: lock html+body scroll and contain overscroll

Sync English content with Korean: GPTaku plugin descriptions and workflows

Fix GPTaku plugin installation guide to match official README

Rewrite hooks section: focus on safety hook + completion notification for vibe coders

Fix 품앗이 descriptions: Codex is optional, works with Claude alone

Fix sidebar sticky: change body overflow-x hidden to clip

Integrate GPTaku plugins across sections, fix numbering and sidebar

Migrate to path-based i18n routing, add vibe-coding section, fix SEO issues

Update watermark text: fivetaku → GPTaku

Remove watermark from hero section (z-index fix)

Increase watermark opacity to 22%

Add CC BY-NC 4.0 license

Increase watermark opacity from 7% to 12%

Rewrite section 1 for non-developer audience + add watermark

Fix page scroll-to-top on section change