feat(markers): get by id

src/main/java/com/ddf/vodsystem/controllers/GlobalExceptionHandler.java

@@ -115,4 +115,11 @@ public class GlobalExceptionHandler {
         APIResponse<Void> response = new APIResponse<>(ERROR, ex.getMessage(), null);
         return ResponseEntity.status(HttpStatus.CONFLICT).body(response);
     }
+
+    @ExceptionHandler(MarkerNotFound.class)
+    public ResponseEntity<APIResponse<Void>> handleMarkerNotFound(MarkerNotFound ex) {
+        logger.error("MarkerNotFound: {}", ex.getMessage());
+        APIResponse<Void> response = new APIResponse<>(ERROR, ex.getMessage(), null);
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response);
+    }
 }

src/main/java/com/ddf/vodsystem/controllers/MarkerController.java

@@ -33,6 +33,15 @@ public class MarkerController {
         );
     }
 
+    @GetMapping("/{id}")
+    public ResponseEntity<APIResponse<MarkerResponse>> getMarkerById(@PathVariable Long id) {
+        Marker marker = markerService.getMarkerById(id);
+
+        return ResponseEntity.ok(
+                new APIResponse<>(SUCCESS, "Marker retrieved successfully", convertToDTO(marker))
+        );
+    }
+
     @PostMapping("")
     public ResponseEntity<APIResponse<MarkerResponse>> createMarker(@Valid @RequestBody MarkerCreateRequest request) {
         Marker marker = markerService.create(request.message());