Add UGAHacks 12 (opens soon; pre-registration only)

[ChimdumebiNebolisa]

Summary

• Add UGAHacks 12 as opens_soon
• Site offers pre-registration only; that is not participant application open

Closes #169

Evidence

• https://ugahacks.com — “Pre-registration Now Open” Google Form
• No live /register or /apply application flow

Test plan

• Listing state=opens_soon

[Jose-Gael-Cruz-Lopez]

Synced with main and corrected state from open to opens_soon.

The listing's own title already said "Pre-Registration Open", but state was set to open — the two disagreed. Pre-registration is not an application round.

ugahacks.com's only participant CTA is "Pre-Register for UGAHacks 12" → a Google Form titled "UGAHacks 12 Pre-Registration". There is no application form and no date published for this cycle yet, so opens_soon with no deadline is the accurate state. Title left as-is since it was already correct.