fix: Admin consent logs - implement Export CSV, fix delete, switch to better-sqlite3

- Replace Astro DB with better-sqlite3 for reliable SQLite access
- Implement Export CSV feature in admin panel
- Fix delete consent function (make it global)
- Add better-sqlite3 dependency

db/schema.ts

@@ -2,7 +2,7 @@ import { defineDb, defineTable, column } from 'astro:db';
 
 export const ConsentLog = defineTable({
   columns: {
-    id: column.number({ primaryKey: true }),
+    id: column.number({ primaryKey: true, autoIncrement: true }),
     sessionId: column.text({ unique: true }),
     timestamp: column.date(),
     essential: column.boolean(),