refactor(ssm): extract CreatePatchBaselineInput and CreateAssociationInput

[vieiralucas]

Summary

The two longest functions in the SSM sub-modules were create_patch_baseline (~150 lines) and create_association_inner (~162 lines). Both were dominated by body parsing, field validation, and field extraction — with the actual state mutation only in the last 30-40 lines.

This extracts dedicated *Input structs with from_body() constructors, leaving each function focused on idempotency, ID generation, and struct assembly. Same pattern as PRs #324/#328/#338/#355/#356.

Test plan

• cargo clippy -p fakecloud-ssm --all-targets -- -D warnings
• cargo test -p fakecloud-ssm (60 passed)

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Summary by cubic

Refactored SSM create flows by extracting CreatePatchBaselineInput and CreateAssociationInput with from_body() parsing and validation. This simplifies create_patch_baseline and create_association_inner and keeps them focused on idempotency and state updates.

• Refactors
  • Moved body parsing, field extraction, and validation into CreatePatchBaselineInput::from_body and CreateAssociationInput::from_body.
  • Shortened the two longest functions and improved readability and testability.
  • Preserved behavior, defaults, and validation logic (no functional changes).

^{Written for commit 7289b60. Summary will update on new commits.}

[cubic-dev-ai]

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