Added the Real Time Admin Dashboard Notification

[SOUVIK-D10]

Issue Link

Closes #127

Changes Made

• Added Notification Service that sends real time updates to admin board via SSE
• Refactored OrderService and OrderNotificationService to match standards of coding
• Refactored DashboardController and DashboardService to integrate subscription feature

Type of Change

• New feature
• Code refactor

Testing Performed

• Sperate testing of new modules
• Multiple Window listening at same time
• Integrate Module test

Backend Testing

• [ PASS] API endpoints tested locally with Postman/curl
• [ PASS] Database migrations verified

How to test

open many command prompts and setup listening of notification then place orders and see the notifications are comming or not

Additional Notes

• Need proper security structure to limit access of notification

[Copilot]

Pull request overview

Adds a real-time notification channel for admin dashboard order updates by introducing an SSE-based notification service and wiring it into order creation/status updates, then exposing a dashboard endpoint for clients to subscribe per-branch.

Changes:

• Replaced the old OrderNotificationService concrete class with an interface and added OrderNotificationServiceImpl using SseEmitter fan-out per branch.
• Updated OrderServiceImpl to publish notifications on new orders and status changes via the injected notification service.
• Extended dashboard service/controller to provide an SSE subscription endpoint for branch notifications.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
RestroHub/src/main/java/com/restroly/qrmenu/order/service/OrderNotificationService.java	Converts notification contract to an interface and adds SSE subscription method.
RestroHub/src/main/java/com/restroly/qrmenu/order/service/impl/OrderServiceImpl.java	Injects notification service and triggers events on order create/status update.
RestroHub/src/main/java/com/restroly/qrmenu/order/service/impl/OrderNotificationServiceImpl.java	Implements SSE emitter registry and broadcast logic for order events.
RestroHub/src/main/java/com/restroly/qrmenu/admin/dashboard/service/DashboardService.java	Adds API to switch on branch notifications (SSE).
RestroHub/src/main/java/com/restroly/qrmenu/admin/dashboard/service/DashboardServiceImpl.java	Validates branch existence and delegates subscription to notification service.
RestroHub/src/main/java/com/restroly/qrmenu/admin/dashboard/controller/DashboardController.java	Exposes SSE stream endpoint for admin dashboard notifications.

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[SOUVIK-D10]

Changes made:-
Added Notifications module
refactored dashboardcontroller and put notification request in dashboardnotification controller
made generic Sse interface and abstract class for easier implementation
currently has:
branchId listening for order
If you want AdminId listening do let me know