Fix scripts for Next.js + Payload CMS workflow

- new-project.sh: Use nextjs-payload-starter template, Next.js AI rules
- convert-astro.sh: Complete rewrite to migrate Astro MDX to Payload CMS Lexical JSON
- deploy.sh: Check for next.config instead of astro.config.mjs, use MONGODB_URL
- preview.sh: Check for Next.js, default port 3002
- audit-seo.sh: Check .tsx pages in src/app, Next.js config

All scripts now properly support Next.js + Payload CMS workflow.

skills/website-creator/scripts/deploy.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #===============================================================================
-# deploy.sh - Deploy Astro + Payload CMS ไปยัง Easypanel
+# deploy.sh - Deploy Next.js + Payload CMS ไปยัง Easypanel
 #
 # Usage: ./deploy.sh [project-path] [server] [domain]
 #
@@ -49,7 +49,7 @@ print_usage() {
     cat << EOF
 Usage: $(basename "$0") [project-path] [server] [domain]
 
-Deploy Astro + Payload CMS ไปยัง Easypanel
+Deploy Next.js + Payload CMS ไปยัง Easypanel
 
 Arguments:
   project-path    ที่อยู่ project (default: current directory)
@@ -87,8 +87,8 @@ check_requirements() {
         exit 1
     fi
 
-    if [ ! -f "astro.config.mjs" ]; then
-        log_error "ไม่พบ astro.config.mjs"
+    if [ ! -f "next.config.ts" ] && [ ! -f "next.config.js" ]; then
+        log_error "ไม่พบ next.config.ts หรือ next.config.js"
         exit 1
     fi
 
@@ -180,7 +180,7 @@ show_deploy_instructions() {
     echo "  4. ใส่ git repo URL"
     echo "  5. ตั้งค่า environment variables:"
     echo "     - PAYLOAD_SECRET"
-    echo "     - DATABASE_URL"
+    echo "     - MONGODB_URL"
     echo "  6. ตั้งค่า domain: $DOMAIN"
     echo "  7. Deploy"
     echo ""
@@ -209,14 +209,14 @@ create_deploy_config() {
   "domain": "$DOMAIN",
   "build": {
     "command": "npm run build",
-    "output": "dist"
+    "output": ".next"
   },
   "environment": {
     "NODE_ENV": "production"
   },
   "required_env": [
     "PAYLOAD_SECRET",
-    "DATABASE_URL"
+    "MONGODB_URL"
   ]
 }
 EOF
@@ -231,7 +231,7 @@ EOF
 main() {
     echo "=============================================="
     echo "  Deploy Tool"
-    echo "  Astro + Payload CMS -> Easypanel"
+    echo "  Next.js + Payload CMS -> Easypanel"
     echo "=============================================="
     echo ""