fix: remove app spaces in fasta header

[vtnphan]

Pull Request

Summary

SBP-671 Remove fasta header spaces in samplesheet (WISPS workflow)

Changes

• Added sanitize_filename() in app/services/s3.py: strips any character outside [A-Za-z0-9._-] to _, falling back to "file" if empty; applied to S3 upload keys.
• build_gadi_input_path() (globus_transfer.py) now sanitizes the filename before building the Gadi input path.
• WispsSequenceItem.id (interaction_screening.py) now enforces the same ^[A-Za-z0-9._-]+$ pattern via Pydantic, rejecting unsafe IDs at the API boundary.
• No breaking changes; only previously-unsafe inputs are affected.

How to Test

1. Submit an interaction-screening request with a sequence id containing [, ], or spaces and confirm it's rejected with a validation error.
2. Upload a file with an unsafe filename (spaces/brackets) and confirm the resulting S3 key/Gadi path has those characters replaced with _.
3. uv run pytest tests/test_schemas.py tests/test_services_s3.py — new tests cover the pattern validation and sanitizer.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added or updated documentation where necessary
• I have run linting and unit tests locally
• The code follows the project's style guidelines