fix(treasury): scope finance access and hide it when the module is off

Accounts can be edited, including the opening balance, and finance sections and accounts can be granted on a role or on one user. The finance menu stays hidden when the organization module is disabled.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20261104090000_role_treasury_accounts/migration.sql

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+ALTER TABLE "OrgRole" ADD COLUMN "treasuryAccountIds" TEXT[] NOT NULL DEFAULT ARRAY[]::TEXT[];

apps/api/prisma/migrations/20261104110000_role_treasury_own_accounts/migration.sql

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+ALTER TABLE "OrgRole" ADD COLUMN "treasuryOwnAccounts" BOOLEAN NOT NULL DEFAULT false;

apps/api/prisma/migrations/20261104120000_user_treasury_access/migration.sql

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+ALTER TABLE "Membership" ADD COLUMN "treasuryAccessOverride" JSONB;