sync(kling): add model_name parameter to motion transfer tool

[Copilot]

Syncs the Kling MCP server against the updated OpenAPI spec from AceDataCloud/Docs. All 22 changed services were audited; only one gap was found.

Changes

kling/core/types.py

• Added KlingMotionModel = Literal["kling-v2-6", "kling-v3"] — the motion endpoint supports a distinct, smaller model subset vs. the main video endpoint

kling/tools/motion_tools.py

• Added optional model_name: KlingMotionModel | None to kling_generate_motion, sent through to the API only when explicitly set

# Now callable with model selection:
kling_generate_motion(
    image_url="https://example.com/character.jpg",
    video_url="https://example.com/motion.mp4",
    model_name="kling-v3",  # previously unsupported
)

kling/tests/test_motion_tools.py (new)

• 5 unit tests covering: omitted-when-None, both valid model values, combined with mode/orientation params

• Fixes sync: update from Docs (cd5227f docs: sync from PlatformBackend [automated]) #492