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

src/pages/api/consent/[sessionId].ts

@@ -0,0 +1,39 @@
+import type { APIRoute } from 'astro';
+import Database from 'better-sqlite3';
+import { join } from 'path';
+
+export const prerender = false;
+
+const DB_PATH = join(process.cwd(), 'data', 'consent.db');
+
+function getDb() {
+  return new Database(DB_PATH);
+}
+
+export const DELETE: APIRoute = async ({ params }) => {
+  try {
+    const sessionId = params.sessionId;
+    if (!sessionId) {
+      return new Response(
+        JSON.stringify({ error: 'Missing sessionId' }),
+        { status: 400, headers: { 'Content-Type': 'application/json' } }
+      );
+    }
+
+    const db = getDb();
+    const stmt = db.prepare('DELETE FROM ConsentLog WHERE sessionId = ?');
+    stmt.run(sessionId);
+    db.close();
+    
+    return new Response(
+      JSON.stringify({ success: true, message: 'Consent deleted' }),
+      { status: 200, headers: { 'Content-Type': 'application/json' } }
+    );
+  } catch (error) {
+    console.error('Error deleting consent:', error);
+    return new Response(
+      JSON.stringify({ error: 'Failed to delete consent' }),
+      { status: 500, headers: { 'Content-Type': 'application/json' } }
+    );
+  }
+};