implement better-auth auth with postgres and route protection

app/api/filings/[accessionNumber]/analyze/route.ts

@@ -1,4 +1,5 @@
 import { asErrorMessage, jsonError } from '@/lib/server/http';
+import { requireAuthenticatedSession } from '@/lib/server/auth-session';
 import { enqueueTask } from '@/lib/server/tasks';
 
 type Context = {
@@ -6,6 +7,11 @@ type Context = {
 };
 
 export async function POST(_request: Request, context: Context) {
+  const { session, response } = await requireAuthenticatedSession();
+  if (response) {
+    return response;
+  }
+
   try {
     const { accessionNumber } = await context.params;
 
@@ -14,6 +20,7 @@ export async function POST(_request: Request, context: Context) {
     }
 
     const task = await enqueueTask({
+      userId: session.user.id,
       taskType: 'analyze_filing',
       payload: { accessionNumber: accessionNumber.trim() },
       priority: 65