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fix(files): address code review findings for file upload

- change file delimiter from ~ to !! to avoid filename conflicts
- add filename validation rejecting !! and newline characters
- add X-Content-Type-Options: nosniff header for file downloads
- fix SizeLimit middleware to use MaxFileSize when files enabled
- remove redundant MaxFileSize default checks (CLI provides defaults)
- simplify ParseFileHeader by removing splitHeader wrapper
- add comprehensive tests for file upload/download handlers