feat: add payouts/instant, payout-methods, slack, stripe/connect routes

[FrostGraphix]

Summary

Closes #1036
Closes #1033
Closes #1013
Closes #1010

Changes

#1036 — POST /api/routes-d/payouts/instant

Request an instant payout. Validates amount (positive number), currency, and destinationId. Checks wallet exists, creates a transaction record with type: instant_payout, returns 201.

#1033 — GET,POST /api/routes-d/payout-methods

List and add payout methods. GET returns all methods for the user ordered by creation date. POST validates type and label, auto-sets isDefault: true on first method, returns 201.

#1013 — POST /api/routes-b/integrations/slack

Configure Slack notifications. Validates webhookUrl (must be HTTPS) and channel. Upserts an integration record with type: slack, wrapped with withRequestId.

#1010 — POST /api/routes-b/integrations/stripe/connect

Connect a Stripe account. Validates code, rejects if already connected (409). Upserts integration with type: stripe, returns 201. Wrapped with withRequestId.

Test plan

• Auth guard tests: 401 on missing/invalid token for all endpoints
• Validation tests: 422 on bad input, 409 on duplicate Stripe connection
• Happy path tests: correct status codes and response shapes

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