Release v2.0.0

Changed (breaking)

• Complete rewrite targeting the Merchant API v2.
• Entry point changed from static facade Bobospay::setClientId() to instantiable BobospayClient.
• Environment is now detected automatically from the client_id prefix (ci_dev_*, ci_test_*, ci_live_*). No need to call setEnvironment().
• Minimum PHP version raised to 8.1.

Added

• BobospayClient -- main SDK entry point.
• Config -- holds credentials and resolves base URL from client_id prefix.
• TransactionService -- list, create, find, generateToken.
• CustomerService -- list, create (upsert), find.
• AccountService -- get, balances, currencies, paymentMethods.
• CurrencyService -- list.
• CreateTransactionDTO / CreateCustomerDTO -- typed request objects.
• WebhookValidator -- HMAC-SHA256 signature verification for incoming webhooks.
• Typed exceptions: AuthenticationException, NotFoundException, NotAcceptableException, ValidationException, ApiException.
• Laravel service provider and facade with auto-discovery.
• Manual autoload.php for use without Composer.
• BobospayClient::withHttpClient() factory for testing with a custom HTTP transport.
• GitHub Actions workflows for CI (matrix PHP 8.1-8.4) and automated releases.

Removed

• Static Bobospay facade and all v1 classes (Customer, Transaction, Currency, init.php).