chore: add PEP 484 type annotations to animationservice.py

[yehorcallmedai-maker]

This PR adds PEP 484 type annotations to all static methods in AnimationService.

Changes

• Added from typing import Optional import
• Annotated 9 static method signatures with parameter types and return types
• No logic changes — purely additive metadata

Methods annotated

• import_bvh_file_as_pose
• get_max_keyframe
• make_cyclic
• get_bone_movement_distance
• move_bone_for_all_keyframes
• duplicate_keyframes
• duplicate_keyframe
• get_key_frames_as_dict
• set_key_frames_from_dict

Continues the annotation series from #377 (logservice), #378 (systemservice), #380 (modifierservice), and #381 (assetservice, open).

Generated and verified by Symbiote — autonomous Python annotation engine.

[joepal1976]

Thanks.

That Optional[int] is needed in the first place puts a finger at an ugly code construct which should probably be fixed. But that is a problem with the code and not the type hinting.

The merge-base changed after approval.

[joepal1976]

Github is playing silly buggers here...

The merge-base changed after approval.