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/app/api/conversations/[id]/messages/[messageId]/route.ts

@@ -1,3 +1,10 @@
+// ── Messages: Single Message ─────────────────────────────────────────────────
+// DELETE /api/conversations/[id]/messages/[messageId]
+//   — Delete a specific message (soft-delete) owned by the current user.
+//   — Handles cleanup of associated voice note audio files.
+//
+// Auth: authenticated; user must be a participant and the message sender
+
 import { NextRequest, NextResponse } from "next/server"
 import { getSessionUser } from "@/lib/auth"
 import { query } from "@/lib/db"
@@ -5,6 +12,8 @@ import { unlink } from "node:fs/promises"
 import { join } from "node:path"
 import { existsSync } from "node:fs"
 
+// ── DELETE ───────────────────────────────────────────────────────────────────
+
 export async function DELETE(
   _request: NextRequest,
   { params }: { params: Promise<{ id: string; messageId: string }> },