feat: Add complete PDPA compliance pages

- Admin dashboard (/admin/consent-logs) with password auth
- Consent API (/api/consent) with SQLite + IP hashing
- Privacy Policy (Thai) - PDPA Section 36 compliant
- Terms & Conditions (Thai) - 9 standard clauses
- .env.example template with Umami placeholder

All pages preserve current design system.

dealplustech-astro/node_modules/cross-fetch/dist/node-polyfill.js

@@ -0,0 +1,11 @@
+const fetchNode = require('./node-ponyfill')
+
+if (!global.fetch) {
+  const fetch = fetchNode.fetch.bind({})
+
+  global.fetch = fetch
+  global.fetch.polyfill = true
+  global.Response = fetchNode.Response
+  global.Headers = fetchNode.Headers
+  global.Request = fetchNode.Request
+}