feat(skills): Add mandatory Notion output requirement to all audit skills

All SEO (10-18) and GTM (20-21) skills now require saving reports to:
- Database: OurDigital SEO Audit Log (2c8581e5-8a1e-8035-880b-e38cefc2f3ef)
- Format: Korean content with English technical terms
- Audit ID: [TYPE]-YYYYMMDD-NNN

Updated files:
- 9 SEO skills (code/CLAUDE.md + desktop/SKILL.md)
- 2 GTM skills (code/CLAUDE.md + desktop/SKILL.md)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

custom-skills/12-seo-local-audit/desktop/SKILL.md

@@ -114,3 +114,12 @@ Validate LocalBusiness markup presence and accuracy.
 - GBP data requires manual access
 - Citation discovery limited to searchable sources
 - Cannot update external directories
+
+## Notion Output (Required)
+
+All audit reports MUST be saved to OurDigital SEO Audit Log:
+- **Database ID**: `2c8581e5-8a1e-8035-880b-e38cefc2f3ef`
+- **Properties**: Issue (title), Site (url), Category, Priority, Found Date, Audit ID
+- **Language**: Korean with English technical terms
+- **Audit ID Format**: [TYPE]-YYYYMMDD-NNN
+