fix(api): dedupe supported webhook event types into one constant

[duyet]

Fixes #378

WEBHOOK_EVENT_TYPES (validation.ts) and WEBHOOK_EVENTS (webhook.ts) were two independent copies of the same list. Collapsed to one source of truth — webhook.ts now imports from validation.ts.

Test plan

• bunx tsc --noEmit
• bunx vitest run test/webhooks.test.ts test/webhook-retry.test.ts (40 passed)
• bunx biome check

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 26bbf4e1-eb9f-4194-a478-32d34181574a

📥 Commits

Reviewing files that changed from the base of the PR and between bc0b32a and b1bd676.

📒 Files selected for processing (1)

• packages/api/src/lib/webhook.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/webhook-events-dedup

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