chore: Add deployment checklist and PM2 configuration examples

This commit introduces a new `DEPLOYMENT_CHECKLIST.md` file that outlines the necessary steps for configuring server-specific settings after pulling from Git. It includes instructions for environment files, PM2 configuration, firewall rules, database setup, and building frontends. Additionally, it adds an example `ecosystem.config.js.example` file for PM2 configuration, providing a template for users to customize for their deployment environment. The `.gitignore` file is updated to include the new PM2 ecosystem config file.

viewer-frontend/app/api/auth/[...nextauth]/route.ts

@@ -5,6 +5,7 @@ import bcrypt from 'bcryptjs';
 
 export const { handlers, signIn, signOut, auth } = NextAuth({
   secret: process.env.NEXTAUTH_SECRET,
+  trustHost: true, // Trust all hosts (for development/internal network)
   providers: [
     CredentialsProvider({
       name: 'Credentials',