feat: Secure API routes with authentication checks and enhance redirect handling for unauthenticated users.

app/api/analyze-manual/route.ts

@@ -1,4 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server'
+import { isAuthenticatedNextjs } from "@convex-dev/auth/nextjs/server";
 import { z } from 'zod'
 import { analyzeFromText } from '@/lib/scraper'
 import { performDeepAnalysis } from '@/lib/analysis-pipeline'
@@ -11,6 +12,14 @@ const bodySchema = z.object({
 
 export async function POST(request: NextRequest) {
   try {
+    if (!(await isAuthenticatedNextjs())) {
+      const redirectUrl = new URL("/auth", request.url);
+      const referer = request.headers.get("referer");
+      const nextPath = referer ? new URL(referer).pathname + new URL(referer).search : "/";
+      redirectUrl.searchParams.set("next", nextPath);
+      return NextResponse.redirect(redirectUrl);
+    }
+
     const body = await request.json()
     const { productName, description, features } = bodySchema.parse(body)