docs: Update AGENTS.md with smart migration workflow

Updates:
- Added Smart Migration Workflow (Detect, Plan, Preserve, Convert, Rebuild, Enhance, Test)
- Updated Dockerfile specs (npm install, port 80)
- Added migrate_existing_website.py to WHERE TO LOOK
- Migration planning with risk assessment
- Content preservation guarantees

AGENTS.md

@@ -1,7 +1,7 @@
 # PROJECT KNOWLEDGE BASE
 
 **Generated:** 2026-03-08  
-**Updated:** 2026-03-09 (Website Creator + SEO Skills Complete)  
+**Updated:** 2026-03-10 (Smart Migration + Dockerfile Fixes)  
 **Type:** OpenCode Skills Collection - PDPA-Compliant Website Generator with Auto-Deploy + SEO Multi-Channel Marketing
 
 ---
@@ -25,7 +25,19 @@ Personal collection of OpenCode skills for AI-powered terminal coding assistant.
 - ✅ **Image integration** - Auto-generate/edit images for content
 - ✅ **Auto-publish** - Direct write to Astro content collections
 
-### **Latest Updates (2026-03-09):**
+### **Latest Updates (2026-03-10):**
+- ✅ **Smart Migration Workflow** - Detect, Plan, Preserve, Convert, Rebuild, Enhance, Test
+- ✅ **Tech Stack Detection** - Auto-detects Astro, Tailwind, CSS frameworks
+- ✅ **Migration Planning** - Risk assessment before migration
+- ✅ **Content Preservation** - Keeps ALL inline CSS and content exactly
+- ✅ **Dockerfile** - Uses npm install (not npm ci), port 80 only
+- ✅ **Website Creator** - Reverted to Dockerfile deployment
+- ✅ **Thai Legal Templates** - PDPA-compliant Privacy Policy & Terms of Service
+- ✅ **Cookie Consent** - Working implementation (blocks cookies until consent)
+- ✅ **Template Structure** - Consistent structure for all websites
+- ✅ **Build Testing** - Test build before deployment
+
+### **Previous Updates (2026-03-09):**
 - ✅ **Website Creator** - Reverted to Dockerfile deployment
 - ✅ **Thai Legal Templates** - PDPA-compliant Privacy Policy & Terms of Service
 - ✅ **Cookie Consent** - Working implementation (blocks cookies until consent)
@@ -71,6 +83,7 @@ opencode-skill/
 | Install all skills | `scripts/install-skills.sh` | Uses unified .env, copies to `~/.config/opencode/` |
 | Add new skill | `skills/skill-creator/` | Use create_skill.py to scaffold |
 | Generate website (AUTO-DEPLOY) | `skills/website-creator/scripts/create_astro_website.py` | ✅ Auto-syncs to Gitea, auto-deploys to Easypanel |
+| **Migrate Existing Website** | `skills/website-creator/scripts/migrate_existing_website.py` | ✅ Smart migration with tech detection |
 | **Website Templates** | `skills/website-creator/scripts/templates/` | ✅ Thai legal templates, cookie consent |
 | Sync to Gitea (standalone) | `skills/gitea-sync/scripts/sync.py` | Create/update repos, push code |
 | Deploy to Easypanel (standalone) | `skills/easypanel-deploy/scripts/deploy.py` | Uses username/password auth (Dockerfile) |
@@ -160,7 +173,7 @@ description: Brief description. Use when user wants to [action].
 - **Monitoring:** Checks deployment status 3 times
 - **Auto-fix:** Triggers redeploy if deployment fails
 - **Output:** Returns both Gitea repo URL and Easypanel deployment URL
-- **Build method:** Dockerfile (not nixpacks)
+- **Build method:** Dockerfile (npm install, port 80 only)
 
 ### Thai Legal Compliance (NEW 2026-03-09)
 - **Privacy Policy:** PDPA-compliant template (Thai Personal Data Protection Act)
@@ -170,14 +183,36 @@ description: Brief description. Use when user wants to [action].
 - **DPO Requirements:** Template includes DPO contact section
 - **PDPC Complaints:** Template includes complaint procedures
 
-### Build Testing (NEW 2026-03-09)
-Before deployment, website-creator tests:
-- Docker build completes successfully
-- All pages are accessible
-- Cookie consent blocks tracking scripts
-- Contact forms work
-- Mobile responsiveness
-- Backend functions (if applicable)
+### Smart Migration Workflow (NEW 2026-03-10)
+For migrating existing websites safely:
+1. **DETECT** - Auto-detects tech stack (Astro, Tailwind, CSS)
+2. **PLAN** - Creates detailed migration plan with risks
+3. **PRESERVE** - Keeps ALL inline CSS and content exactly
+4. **CONVERT** - Converts CSS frameworks (Tailwind v3→v4)
+5. **REBUILD** - Fresh Astro install with preserved content
+6. **ENHANCE** - Adds new features (cookie consent, PDPA)
+7. **TEST** - Comprehensive testing before deployment
+
+**Usage:**
+```bash
+# Create migration plan first
+python3 skills/website-creator/scripts/migrate_existing_website.py \
+  --input "./existing-website" \
+  --output "./migrated-website" \
+  --plan-only
+
+# Review plan, then proceed with migration
+python3 skills/website-creator/scripts/migrate_existing_website.py \
+  --input "./existing-website" \
+  --output "./migrated-website"
+```
+
+**Benefits:**
+- ✅ No more broken CSS
+- ✅ No more failed deployments
+- ✅ All inline styles preserved
+- ✅ All routes preserved
+- ✅ Plan before migrating (safe!)
 
 ### Unified Credentials (NEW 2026-03-08)
 - Single `/.env` file for ALL skills