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/dashboard/leads-per-month-chart.tsx

@@ -1,3 +1,7 @@
+// ── Dashboard: Leads Per Month Bar Chart ──
+// Interactive SVG bar chart comparing new leads vs. closed leads per month.
+// Supports year navigation, hover tooltip with close rate, and gradient-filled bars.
+
 "use client"
 
 import { useState, useMemo, useEffect } from "react"
@@ -6,6 +10,7 @@ import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
 import { Button } from "@/components/ui/button"
 import { ChevronLeft, ChevronRight } from "lucide-react"
 
+/** A single month's data point */
 interface IntervalData {
   label: string
   leads: number
@@ -16,9 +21,15 @@ interface LeadsPerMonthChartProps {
   data: IntervalData[]
 }
 
+/** Color constants for new leads and closed bars */
 const NEW_LEADS = "#C84B4B"
 const CLOSED = "#5A8FC4"
 
+/**
+ * LeadsPerMonthChart — bar chart rendered with SVG.
+ * Features: year navigation, hover highlight/tooltip, legend, gradient fills,
+ * grid lines with tick labels, and summary stats (total new, total closed, close rate).
+ */
 export function LeadsPerMonthChart({ data: initialData }: LeadsPerMonthChartProps) {
   const [year, setYear] = useState(new Date().getFullYear())
   const [chartData, setChartData] = useState<IntervalData[]>(initialData)