Add Event Props booking lifecycle fields

[z-mailme]

Adds Event Props for Hire SA booking lifecycle support.

Includes:

• Event Props deal-stage labels
• Quote status
• Invoice status
• Payment status
• Calendar status
• Booking lifecycle timestamps
• Google Calendar event ID
• Deposit amount
• Balance amount
• REST API PATCH support
• Deal booking-status UI section
• Prisma migration: 20260828120000_event_booking_statuses

Source commit:
09eff59

Important:
Do not deploy or run the production database migration until the PR has been reviewed and merged.

---

Summary by cubic

Adds event booking lifecycle tracking to deals: quote, invoice, payment, and calendar statuses with timestamps, deposit/balance amounts, and a Google Calendar event ID.

• Extends the deal update contract and service to persist the new fields; existing deals keep safe defaults.
• Adds an "Event / booking status" section to the deal sheet showing each status, its timestamp, and deposit/balance amounts.
• Renames deal stage labels to booking terms (Demo booked → New Enquiry, Closed won → Booked, etc.).

Migration

• Run 20260828120000_event_booking_statuses only after this PR is reviewed and merged; it adds columns with safe defaults.

^{Written for commit 09eff59. Summary will update on new commits.}

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[github-actions]

Retargeted this onto main.

release is the default branch so that a plain clone runs the last tagged release, but nothing merges into it — it is fast-forwarded onto the tag by the Release workflow and that is all. Changes go to main, and reach release when a release is cut.

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git rebase origin/main
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