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.

src/components/chats/voice-call-modal.tsx

@@ -1,3 +1,7 @@
+// ── Chats: Voice Call Modal Component ──
+// WebRTC-based voice call UI. Allows searching contacts or dialing a number,
+// creates a call room, and shares the join link via WhatsApp or clipboard.
+
 "use client"
 
 import { useState, useEffect, useCallback } from "react"
@@ -17,6 +21,7 @@ interface VoiceCallModalProps {
   onClose: () => void
 }
 
+/** Converts a phone number to international format suitable for WhatsApp links */
 function formatPhoneForWhatsApp(phone: string): string {
   const digits = phone.replace(/[^0-9]/g, "")
   if (!digits) return ""
@@ -25,6 +30,11 @@ function formatPhoneForWhatsApp(phone: string): string {
   return digits
 }
 
+/**
+ * VoiceCallModal — modal for initiating a WebRTC voice call.
+ * Steps: 1) Select contact or dial number, 2) Create room & get link,
+ * 3) Share link via WhatsApp or copy to clipboard, 4) Open call page.
+ */
 export default function VoiceCallModal({ open, onClose }: VoiceCallModalProps) {
   const [contacts, setContacts] = useState<Contact[]>([])
   const [contactsLoading, setContactsLoading] = useState(false)