Enhance Notification Management with New Endpoints and Response Structures

- Added new endpoints for retrieving notifications for both admins and users, improving the flexibility of the notification system.
- Implemented query parameters for filtering notifications by status, method, event type, type, and recipient, enhancing usability.
- Introduced new response structures for notifications, including pagination information, to provide better data handling in API responses.
- Updated API documentation with Swagger comments for the new endpoints and response formats, ensuring clarity for API consumers.
- Refactored notification handling logic to support the new features, promoting a more robust notification management system.

pkg/notification/USAGE.md

@@ -68,10 +68,82 @@ requests := []*notification.NotificationRequest{...}
 batchResponse, err := sdk.SendBatch(ctx, requests)
 ```
 
+### Getting Notifications
+
+#### Get All Notifications
+```go
+// Get all notifications
+response, err := sdk.GetNotifications(ctx, &notification.GetNotificationsRequest{})
+```
+
+#### Get Notifications with Filters
+```go
+// Get notifications for specific user
+response, err := sdk.GetNotificationsByUser(ctx, "user_id_here", 1, 10)
+
+// Get notifications by status
+response, err := sdk.GetNotificationsByStatus(ctx, "sent", 1, 10)
+
+// Get notifications with custom filters
+req := &notification.GetNotificationsRequest{
+    Status:    "sent",
+    Method:    "email",
+    EventType: "EMAIL",
+    Type:      "info",
+    UserID:    "user_id_here",
+    Page:      1,
+    PerPage:   10,
+}
+response, err := sdk.GetNotifications(ctx, req)
+```
+
+#### Quick Get Notifications
+```go
+// Quick method for basic filtering
+response, err := sdk.QuickGetNotifications(ctx, "user_id_here", "sent")
+```
+
 ## API Response
+
+### Send Notification Response
 - **Success**: `{"status": "Notification sent"}`
 - **Error**: `{"error": "error message"}`
 
+### Get Notifications Response
+```json
+{
+    "data": [
+        {
+            "id": "68ceaaec99c78402b5fec555",
+            "user_id": "689a0aca36bf9aae890c30c1",
+            "title": "CHECK",
+            "message": "Check Send Notification Channels",
+            "link": "",
+            "image": "",
+            "type": "info",
+            "priority": "low",
+            "event_type": "EMAIL",
+            "created_at": "2025-09-20T13:23:56.664Z",
+            "updated_at": "0001-01-01T00:00:00Z",
+            "methods": {
+                "email": "nakhostin.nima1998@gmail.com"
+            },
+            "metadata": null,
+            "status": "sent",
+            "scheduled_at": 0,
+            "is_scheduled": false
+        }
+    ],
+    "pagination": {
+        "total": 3,
+        "count": 3,
+        "per_page": 10,
+        "current_page": 1,
+        "total_pages": 1
+    }
+}
+```
+
 ## Error Handling
 ```go
 if err != nil {