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/shared/data-table.tsx

@@ -1,3 +1,8 @@
+// ── Shared: Data Table Component ──
+// Generic data table powered by @tanstack/react-table.
+// Supports sorting, filtering, row selection, column visibility, faceted values, and pagination.
+// Renders loading skeletons (5 rows) while data is loading.
+
 "use client"
 
 import * as React from "react"
@@ -34,6 +39,11 @@ interface DataTableProps<TData, TValue> {
   emptyMessage?: string
 }
 
+/**
+ * DataTable — fully featured generic table with TanStack Table.
+ * Manages sorting, column filters, row selection, visibility, and pagination internally.
+ * Shows skeleton placeholders when `loading` is true.
+ */
 export function DataTable<TData, TValue>({
   columns,
   data,