MOBILE-258: Allow path prefix for operaionsDomain

[enotniy]

https://tracker.yandex.ru/MOBILE-258

[Copilot]

Pull request overview

Enables operationsDomain to include an optional path prefix (e.g. domain.com/api/v2) so operation endpoints are appended after that prefix, while keeping strict validation (no query/fragment/empty path segments).

Changes:

• Added SdkValidation.isValidOperationsDomain() (host + optional path prefix) and switched configuration/policy validation to use it.
• Updated toBaseUrl/gateway URL-building test coverage to ensure path prefixes are preserved and no double slashes occur.
• Documented the new operationsDomain behavior in MindboxConfiguration.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/src/test/java/cloud/mindbox/mobile_sdk/SdkValidationDomainTest.kt	Adds tests for toBaseUrl path-prefix behavior and new operations-domain validation cases.
sdk/src/test/java/cloud/mindbox/mobile_sdk/managers/GatewayManagerTest.kt	Verifies operations URLs append endpoints after a configured path prefix (and avoid //).
sdk/src/test/java/cloud/mindbox/mobile_sdk/inapp/data/repositories/OperationsDomainConfigPolicyTest.kt	Updates mocks/tests to validate and store operations domains that may include a path prefix.
sdk/src/main/java/cloud/mindbox/mobile_sdk/SdkValidation.kt	Introduces isValidOperationsDomain() and uses it in configuration validation.
sdk/src/main/java/cloud/mindbox/mobile_sdk/MindboxConfiguration.kt	Updates operationsDomain builder documentation to explicitly allow a path prefix.
sdk/src/main/java/cloud/mindbox/mobile_sdk/inapp/data/repositories/OperationsDomainConfigPolicy.kt	Switches policy validation from isValidDomain to isValidOperationsDomain.

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