fix: pass hash as URL param instead of query

[Jerricho93]

fixes #216

Changes the unlisted video hashes in VImeo to be passed as a URL param instead of query param

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Note

Low Risk
Low risk, isolated URL serialization change for Vimeo event embeds that only affects how unlisted hashes (h) are formatted.

Overview
Fixes Vimeo event embed URL generation so unlisted hashes are placed in the URL path (/embed/<hash>) instead of the query string. This keeps h in the query for standard video embeds, but removes it from params when building event URLs.

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