feat: Enhance provider components with detailed documentation and comments

- Added comprehensive comments and JSDoc-style documentation to NotificationProvider, ThemeProvider, UserProvider, and WebsiteThemeProvider for better clarity and maintainability.
- Improved type definitions in index.ts for better code understanding and usage.
- Introduced Docker support with Dockerfiles for various services including AI server, signaling server, and browser-use service.
- Created a docker-compose.yml file to orchestrate multiple services including PostgreSQL, AI, scraper, and frontend.
- Added a startup guide (startup.txt) for setting up the CRM environment on Ubuntu with Docker.
- Included a .dockerignore file to exclude unnecessary files from Docker builds.

next.config.ts

@@ -1,9 +1,15 @@
+// ── Next.js Config ──────────────────────────────────────────────────
+// Security headers, image remote patterns, and build-time ESLint checks.
+// Applied globally to all routes via the headers() async function.
+
 import type { NextConfig } from "next"
 
 const nextConfig: NextConfig = {
+  // Fail the build on ESLint errors — no silent ignores
   eslint: {
     ignoreDuringBuilds: false,
   },
+  // Allow external avatar images from ui-avatars.com
   images: {
     remotePatterns: [
       {
@@ -12,6 +18,8 @@ const nextConfig: NextConfig = {
       },
     ],
   },
+  // ── Security Headers ──────────────────────────────────────────────
+  // Applied to all routes. HSTS is production-only to avoid localhost issues.
   async headers() {
     return [
       {