Allow uploading or updating certificates without forcing a re-upload of an already-stored file. Repository API now accepts an optional filePath or existingFileUri and branches: a new local file is uploaded and a signed URL generated, while an existingFileUri performs a metadata-only update. Verification creation now uses the resolved fileUri; API payload uses the signed URL when available and normalizes expiry to UTC. Domain usecase and params were updated (with an assert ensuring one of filePath or existingFileUri is provided). Presentation page pre-populates the file field for edits, relaxes form validation to accept existing remote URIs, and distinguishes local vs remote paths when invoking the upload use case.
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