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-builder.md

@@ -0,0 +1,55 @@
+# SEO Gateway Builder
+
+Generate SEO-optimized gateway pages from templates.
+
+## Triggers
+- "build gateway page", "generate landing pages", "게이트웨이 페이지 생성"
+
+## Capabilities
+
+1. **Template-based Generation** - Medical, service, local templates
+2. **Batch Creation** - Multiple location × service combinations
+3. **SEO Optimization** - Meta tags, schema, internal links
+4. **Localization** - Korean/English content support
+
+## Scripts
+
+```bash
+# Generate with sample data
+python ourdigital-custom-skills/18-seo-gateway-builder/code/scripts/generate_pages.py
+
+# Custom configuration
+python ourdigital-custom-skills/18-seo-gateway-builder/code/scripts/generate_pages.py \
+  --config config/services.json \
+  --locations config/locations.json \
+  --output ./pages
+```
+
+## Configuration
+
+### services.json
+```json
+{
+  "services": [{
+    "id": "laser_hair_removal",
+    "korean": "레이저 제모",
+    "keywords": ["permanent hair removal"]
+  }]
+}
+```
+
+### locations.json
+```json
+{
+  "locations": [{
+    "id": "gangnam",
+    "korean": "강남",
+    "landmarks": ["COEX", "Gangnam Station"]
+  }]
+}
+```
+
+## Output
+- Markdown files with SEO meta
+- Schema markup included
+- Internal linking suggestions