feat(payments): expand SDK to cover Crowdsplit staging endpoints

[fahmidareem3]

Summary

This PR brings the @oaknetwork/payments-sdk in full alignment with the Crowdsplit staging API by closing the service and type gaps identified during the audit.

New Services

• DisputeService – list disputes, update evidence, submit, and close
• PayoutService – create outbound payments
• SubscriptionService – subscribe, cancel, list, get, and pay subscriptions
• FileService – upload, list, get, and delete files
• TaxService – calculate taxes

Extended Existing Services

• CustomerService – added uploadFiles, getFiles, populatePlatform; fixed balance endpoint from /balance → /balances
• PaymentService – added capture, sandboxPaid, sandboxSettle
• PaymentMethodService – added update method; tightened type fields to use MethodType union; added PlaidResponseData, TradingWallet, and TradingWalletResponseData
• TransferService – added sendWebhook

Type Improvements

• Payment – added PagarMePixRequest, broadened capture_method to include "manual", widened type response field, updated FraudCheckConfig.action_on_fail values
• Transaction – expanded Status, SubStatus, and TransactionType enums; added Installment model; renamed dateFrom/dateTo → date_from/date_to; added provider and strict filter fields
• Webhook – added full EventType and Category enums; added ListNotificationsQuery interface
• Transfer – tightened payment_method.type to "customer_wallet" | "bank" and chain to "polygon" | "celo"
• Buy – added Brla request variant; added celo chain option; added provider_data to Bridge
• Customer – added Status enum; added additional_info, synced, synced_at fields; fixed BalanceResponse.amount → available
• Plan – added overridden_price, campaign_id, campaign_name, active, expired fields/filters
• Provider – added brla, facilita_pay, inter_bank, wallet_service, crowd_split, konduto, cel_coin, cel_baas; added PlatformStatus and KycLevel types
• Sell – added bank payment method variant
• New type namespaces: Dispute, File, Payout, Subscription, Tax

Infrastructure

• httpClient – added postMultipart for file uploads; updated mergeHeaders to omit Content-Type for multipart requests; extended get to support a request body (used by subscription list)
• webhookVerification – updated signature verification to parse the t=<timestamp>,v1=<sig> header format used by Crowdsplit

Tests

• Added integration test suites: disputeService, payoutService, subscriptionService, missingServices, paymentServiceCapture
• Fixed unit test expectation for /balance → /balances endpoint

Notes

• No breaking changes to existing public APIs
• All new services follow the established withAuth + buildUrl pattern
• Changeset bumps @oaknetwork/payments-sdk as a minor release

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