feat: migrate website-creator from Next.js+Payload to Astro+Tina CMS

Major changes:
- Replace Payload CMS with Tina CMS (self-hosted)
- Add Astro DB for consent logging (PDPA compliant)
- Update Tailwind v3 to v4 (@tailwindcss/vite plugin)
- Add astro-tina-starter template
- Rewrite consent template for Astro (ConsentBanner.astro, Astro DB, Nano Stores)
- Add install-tina-backend.sh for self-hosted Tina per customer
- Rename convert-astro.sh to migrate-tina.sh
- Add AGENTS.md template for generated websites
- Delete all Payload/Next.js files

Technical updates:
- Astro DB using defineDb with eq operators for queries
- Tailwind v4 with @theme block
- Tina CMS local development mode
- Proper Astro API routes for consent

Research-verified with official documentation (April 2026)

skills/website-creator/templates/astro-tina-starter/AGENTS.md

@@ -0,0 +1,198 @@
+# Astro Tina Starter - Agent Knowledge Base
+
+**Generated:** 2026-04-17  
+**Version:** 1.0.0  
+**Type:** Astro 6 + Tina CMS Starter Template
+
+---
+
+## OVERVIEW
+
+Starter template for building websites with Astro 6, Tina CMS, and Tailwind CSS 4.x.
+
+### Tech Stack
+
+| Component | Technology | Version |
+|-----------|------------|---------|
+| Framework | Astro | 6.1.7 |
+| CMS | Tina CMS | 2.x |
+| Styling | Tailwind CSS | 4.x |
+| Database | Astro DB | 0.14.x |
+| State | Nano Stores | 0.11.x |
+
+### Key Features
+
+- Self-hosted Tina CMS with schema-based content
+- Tailwind CSS 4.x using `@tailwindcss/vite` plugin
+- Astro DB for consent logging (PDPA compliant)
+- Thai language support with Noto Sans Thai
+- Docker-ready deployment
+
+---
+
+## PROJECT STRUCTURE
+
+```
+astro-tina-starter/
+├── .tina/
+│   ├── config.ts       # Tina CMS configuration
+│   └── schema.ts       # Content schema definitions
+├── db/
+│   ├── config.ts       # Astro DB schema
+│   └── seed.ts         # Database seed script
+├── src/
+│   ├── styles/
+│   │   └── global.css  # Tailwind v4 styles + @theme
+│   ├── layouts/
+│   │   └── Layout.astro
+│   ├── pages/
+│   │   └── index.astro
+│   ├── components/
+│   │   └── Header.astro
+│   └── content/
+│       ├── config.ts   # Astro content collections
+│       ├── posts/       # Blog posts (MDX)
+│       ├── pages/       # Static pages (MDX)
+│       └── settings/    # Site settings (JSON)
+├── public/
+│   └── favicon.svg
+├── Dockerfile
+├── astro.config.mjs
+├── tsconfig.json
+└── package.json
+```
+
+---
+
+## IMPORTANT CONVENTIONS
+
+### Tailwind CSS 4.x Setup
+
+**CRITICAL:** This template uses `@tailwindcss/vite` plugin, NOT `@astrojs/tailwind`.
+
+```javascript
+// astro.config.mjs
+import tailwindcss from '@tailwindcss/vite'
+
+export default defineConfig({
+  vite: {
+    plugins: [tailwindcss()],
+  },
+})
+```
+
+```css
+/* src/styles/global.css */
+@import "tailwindcss";
+
+@theme {
+  --color-primary: #1a1a1a;
+  --color-accent: #3b82f6;
+}
+```
+
+### Tina CMS Content
+
+Tina CMS manages content in `src/content/`:
+- `posts/` - Blog posts (MDX format)
+- `pages/` - Static pages (MDX format)
+- `settings/` - Site settings (JSON format)
+
+Schema defined in `.tina/schema.ts`.
+
+### Astro DB Schema
+
+Consent log table for PDPA compliance in `db/config.ts`.
+
+---
+
+## CREDENTIALS
+
+No external API credentials required for this template.
+
+### Optional Environment Variables
+
+| Variable | Description |
+|----------|-------------|
+| `TINA_TOKEN` | Tina CMS production authentication |
+| `TINA_CLIENT_ID` | Tina CMS client ID |
+| `DATABASE_URL` | Custom database connection (optional) |
+
+---
+
+## COMMANDS
+
+```bash
+# Install dependencies
+npm install
+
+# Development
+npm run dev          # Full dev (Tina + Astro)
+npm run dev:astro    # Astro only
+npm run dev:tina     # Tina CMS only
+
+# Build
+npm run build        # Production build
+npm run preview      # Preview production build
+
+# Database
+npm run db:push      # Push schema to database
+npm run db:seed      # Seed database
+```
+
+---
+
+## PDPA COMPLIANCE
+
+Template includes consent logging via Astro DB:
+
+```typescript
+// db/config.ts
+export const ConsentLog = defineTable({
+  columns: {
+    action: text(),
+    purpose: text(),
+    analytics: boolean(),
+    marketing: boolean(),
+    functional: boolean(),
+    userAgent: text(),
+    ip: text(),
+    timestamp: text(),
+  },
+})
+```
+
+---
+
+## ANTI-PATTERNS
+
+- **NEVER** use `@astrojs/tailwind` (deprecated)
+- **ALWAYS** use `@tailwindcss/vite` for Tailwind v4
+- **NEVER** commit environment files (.env)
+
+---
+
+## DEPLOYMENT
+
+### Docker
+
+```bash
+docker build -t astro-tina-starter .
+docker run -p 8080:80 astro-tina-starter
+```
+
+### Manual
+
+```bash
+npm install
+npm run build
+# Serve dist/ folder with any static server
+```
+
+---
+
+## NOTES
+
+- Tina CMS admin: http://localhost:4321/admin
+- Astro default port: 4321
+- Tina dev server: 3001