feat: implement messaging functionality with real-time updates

- Introduced a messaging module on the backend using NestJS, including repository, service, controller, DTOs, and WebSocket Gateway.
- Developed a frontend messaging page with conversation management, real-time message handling, and chat UI.
- Implemented `MessageService` for API integrations and `SocketProvider` for real-time WebSocket updates.
- Enhanced database schema to support conversations, participants, and messages with Drizzle ORM.

backend/src/messages/messages.controller.ts

@@ -0,0 +1,40 @@
+import {
+	Body,
+	Controller,
+	Get,
+	Param,
+	Post,
+	Req,
+	UseGuards,
+} from "@nestjs/common";
+import { AuthGuard } from "../auth/guards/auth.guard";
+import type { AuthenticatedRequest } from "../common/interfaces/request.interface";
+import { CreateMessageDto } from "./dto/create-message.dto";
+import { MessagesService } from "./messages.service";
+
+@Controller("messages")
+@UseGuards(AuthGuard)
+export class MessagesController {
+	constructor(private readonly messagesService: MessagesService) {}
+
+	@Get("conversations")
+	getConversations(@Req() req: AuthenticatedRequest) {
+		return this.messagesService.getConversations(req.user.sub);
+	}
+
+	@Get("conversations/:id")
+	getMessages(
+		@Req() req: AuthenticatedRequest,
+		@Param("id") conversationId: string,
+	) {
+		return this.messagesService.getMessages(req.user.sub, conversationId);
+	}
+
+	@Post()
+	sendMessage(
+		@Req() req: AuthenticatedRequest,
+		@Body() dto: CreateMessageDto,
+	) {
+		return this.messagesService.sendMessage(req.user.sub, dto);
+	}
+}