Implement full consent logging system with SQLite database

- Install better-sqlite3 and @astrojs/node adapter
- Update consent API to use SQLite database
- Add DELETE endpoint for consent logs
- Update admin consent-logs page with full UI (stats, table, export, delete)
- Add sessionId to consent tracking
- Admin password: Coolm@n1234mo

Note: Database stored at data/consent.db (gitignored)

src/layouts/BaseLayout.astro

@@ -258,10 +258,19 @@ const siteUrl = 'https://dealplustech.co.th';
         });
         
         function saveConsent(preferences) {
+          // Get or generate sessionId
+          let sessionId = localStorage.getItem('consent-session-id');
+          if (!sessionId) {
+            sessionId = crypto.randomUUID();
+            localStorage.setItem('consent-session-id', sessionId);
+          }
+          
           const consentData = {
             ...preferences,
+            sessionId,
             timestamp: Date.now(),
-            policyVersion: '1.0'
+            policyVersion: '1.0',
+            userAgent: navigator.userAgent
           };
           localStorage.setItem('consent-preferences', JSON.stringify(consentData));