MAINT: P311-01 extend typing.Self to SeedDataset and Scorable factories

[成功したナイロンカエル (vito233)]

Description

Part of #3166 (P311-01: Extend typing.Self adoption).

This PR completes the remaining cases identified for P311-01, adopting Python 3.11's typing.Self return type annotation across classmethod factories that construct through cls but previously annotated a fixed base-class return type, causing subclass invocations to lose their concrete types.

Detailed Changes

• pyrit/models/seeds/seed_dataset.py:
  • Imported Self from typing.
  • Updated SeedDataset.from_dict(cls, ...) -> Self (constructed via cls.model_validate).
  • from_yaml_file intentionally left untouched: it delegates to a loader that constructs a fixed base class, per the issue's scoping notes.
• pyrit/models/score/scorable.py:
  • Imported Self from typing.
  • Updated MessageScorable.from_message(cls, ...) -> Self (constructed via cls(...)).
  • Updated ContentScorable.from_message(cls, ...) -> Self (constructed via cls(...)).

Tests and Documentation

• Added subclass assert_type regression tests following the pattern merged in MAINT: P311-01 extend typing.Self adoption across classmethod factories #3194 and MAINT: P311-01 extend typing.Self to Message and AtomicAttackIdentifier factories #3201:
  • test_seed_dataset_from_dict_preserves_subclass_type in tests/unit/models/test_seed_dataset.py
  • test_message_scorable_from_message_preserves_subclass_type and test_content_scorable_from_message_preserves_subclass_type in tests/unit/models/test_scorable.py
• Validation behavior (model_validate and Pydantic validators) unchanged; no runtime behavior change.
• Local verification: targeted unit tests pass (70 passed); ty check pyrit/models tests/unit/models reports zero diagnostics; ruff check / ruff format --check clean on changed files.

[成功したナイロンカエル (vito233)]

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