refactor(skills): Restructure skills to dual-platform architecture

Major refactoring of ourdigital-custom-skills with new numbering system:

## Structure Changes
- Each skill now has code/ (Claude Code) and desktop/ (Claude Desktop) versions
- New progressive numbering: 01-09 General, 10-19 SEO, 20-29 GTM, 30-39 OurDigital, 40-49 Jamie

## Skill Reorganization
- 01-notion-organizer (from 02)
- 10-18: SEO tools split into focused skills (technical, on-page, local, schema, vitals, gsc, gateway)
- 20-21: GTM audit and manager
- 30-32: OurDigital designer, research, presentation
- 40-41: Jamie brand editor and audit

## New Files
- .claude/commands/: Slash command definitions for all skills
- CLAUDE.md: Updated with new skill structure documentation
- REFACTORING_PLAN.md: Migration documentation
- COMPATIBILITY_REPORT.md, SKILLS_COMPARISON.md: Analysis docs

## Removed
- Old skill directories (02-05, 10-14, 20-21 old numbering)
- Consolidated into new structure with _archive/ for reference

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

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

.claude/commands/seo-gateway-architect.md

@@ -0,0 +1,51 @@
+# SEO Gateway Architect
+
+Keyword strategy and content architecture for gateway pages.
+
+## Triggers
+- "keyword strategy", "SEO planning", "게이트웨이 전략"
+
+## Capabilities
+
+1. **Keyword Analysis** - Volume, difficulty, intent
+2. **LSI Keywords** - Related semantic keywords
+3. **Long-tail Opportunities** - Location + service combinations
+4. **Content Architecture** - Recommended H1-H3 structure
+
+## Scripts
+
+```bash
+# Analyze keyword
+python ourdigital-custom-skills/17-seo-gateway-architect/code/scripts/keyword_analyzer.py \
+  --topic "눈 성형"
+
+# With location targeting
+python ourdigital-custom-skills/17-seo-gateway-architect/code/scripts/keyword_analyzer.py \
+  --topic "눈 성형" --market "강남" --output strategy.json
+```
+
+## Output
+
+```
+# Keyword Analysis Report
+
+## Primary Keyword: 강남 눈 성형
+- Search Volume: 12,000
+- Difficulty: 65/100
+- Intent: Informational
+
+## LSI Keywords
+1. 쌍꺼풀 수술 - Volume: 8,000
+2. 눈매교정 - Volume: 5,500
+...
+
+## Recommendations
+1. Focus on educational content
+2. Include FAQ schema markup
+3. Target long-tail keywords for quick wins
+```
+
+## Workflow
+1. Run keyword analysis
+2. Review strategy output
+3. Hand off to `/seo-gateway-builder` for content