refactor: consolidate website response parsing and stabilize facade naming

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+## [Unreleased]
+
+### Changed
+
+- Refactored the SDK around `BtApiManager` and domain facades for a more stable public entry point.
+- Hardened `BtSdkConfig` into an immutable configuration object with stricter build-time validation.
+- Upgraded the Maven quality gate pipeline with `Spotless`, `Checkstyle`, `Surefire`, `Failsafe`, and `JaCoCo`.
+- Defaulted integration tests to opt-in execution to avoid accidental calls against a live BT Panel instance.
+- Aligned `DefaultBtClient` retry behavior with `RetryMode`, including clearer handling for safe-request retries.
+- Added support for `CUSTOM_TRUST_STORE` SSL configuration and clearer SSL startup failures.
+- Split transport responsibilities into `RetryPolicy`, `SslContextConfigurer`, and `RequestEncodingUtils`.
+- Consolidated duplicated website response parsing into shared helpers:
+  `WebsiteApiResponseSupport`, `AbstractWebsiteBooleanApi`, `AbstractWebsiteTextQueryApi`,
+  `AbstractWebsiteMapQueryApi`, and `AbstractWebsiteMapListQueryApi`.
+- Migrated multiple website query endpoints to the shared parsers, including website detail, config,
+  domains, raw list, backups, PHP extensions, SSL certificate list, and limit-net configuration.
+- Standardized `WebsiteOperations` read-side naming toward `list*` methods and kept compatibility
+  aliases deprecated where appropriate.
+
+### Added
+
+- Unit tests for shared website parsing paths, including backups, PHP extensions, SSL certificate
+  lists, and facade delegation coverage for the preferred read-side method names.
+- Public repository metadata and community files such as contributing, security, CI, and release
+  documentation.
+
+### Removed
+
+- Unused legacy API enum and outdated example classes that no longer matched the current SDK design.
+- Library-level binding to a concrete logging implementation.