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.

vitest.config.ts

@@ -1,10 +1,14 @@
+// ── Vitest Config ──────────────────────────────────────────────────
+// Global test helpers enabled, Node environment, and @/ path alias
+// matching the Next.js tsconfig for seamless import resolution.
+
 import { defineConfig } from "vitest/config"
 import path from "path"
 
 export default defineConfig({
   test: {
-    globals: true,
-    environment: "node",
+    globals: true,      // describe/it/expect available without imports
+    environment: "node", // no jsdom — all tests are backend/utility
   },
   resolve: {
     alias: {