chore: Add Sourcery config to ignore generated files

[Rockyy174]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• The first comment line in .sourcery.yaml is indented two spaces, which makes the file technically have an empty root key; consider removing the leading spaces so the file is a clean top-level YAML document.
• For future-proofing, consider using directory or glob patterns (e.g., app/assets/js/api/**) instead of listing single generated files so new generated outputs are automatically ignored without config changes.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The first comment line in `.sourcery.yaml` is indented two spaces, which makes the file technically have an empty root key; consider removing the leading spaces so the file is a clean top-level YAML document.
- For future-proofing, consider using directory or glob patterns (e.g., `app/assets/js/api/**`) instead of listing single generated files so new generated outputs are automatically ignored without config changes.

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