refactor: replace manual model_validate with @model_validate in explore/snippets controllers

[likalikali]

Replace manual model_validate(request.get_json()) calls with the @model_validate decorator in explore and snippets controller files.

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-08-09 05:41:19.308687139 +0000
+++ /tmp/pyrefly_pr.txt	2026-08-09 05:41:08.658630638 +0000
@@ -2075,7 +2075,7 @@
 ERROR Argument `Literal['account']` is not assignable to parameter `created_by_role` with type `CreatorUserRole` in function `models.model.UploadFile.__init__` [bad-argument-type]
     --> tests/unit_tests/controllers/console/datasets/test_datasets_segments.py:1102:29
 ERROR Object of class `FunctionType` has no attribute `assert_called_once_with` [missing-attribute]
-   --> tests/unit_tests/controllers/console/explore/test_trial.py:215:5
+   --> tests/unit_tests/controllers/console/explore/test_trial.py:216:5
 ERROR Argument `str` is not assignable to parameter `view` with type `(InstalledApp) -> str` in function `controllers.console.explore.wraps.decorator` [bad-argument-type]
   --> tests/unit_tests/controllers/console/explore/test_wraps.py:73:18
 ERROR Argument `str` is not assignable to parameter `view` with type `(InstalledApp) -> str` in function `controllers.console.explore.wraps.decorator` [bad-argument-type]

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	58.12%	58.13%	+0.01%
Strict coverage	57.70%	57.71%	+0.01%
Typed symbols	38,059	38,074	+15
Untyped symbols	27,625	27,625	0
Modules	3144	3144	0