feat: add feedback system with modal, api endpoints, and stats tracking

app/api/feedback/route.ts

@@ -0,0 +1,22 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { auth } from '@clerk/nextjs/server';
+import { createFeedback } from '@/lib/db-actions';
+
+export async function POST(request: NextRequest) {
+  const { userId } = await auth();
+
+  const body = await request.json();
+  const message = body?.message?.trim();
+
+  if (!message || message.length === 0) {
+    return NextResponse.json({ error: 'Message is required' }, { status: 400 });
+  }
+
+  if (message.length > 2000) {
+    return NextResponse.json({ error: 'Message is too long' }, { status: 400 });
+  }
+
+  await createFeedback({ message, userId: userId ?? undefined });
+
+  return NextResponse.json({ success: true });
+}