release tasks for 0.6.0

[sttk]

• Update the version number in pom.xml
• Update the texts about version number in README.md
• Update the copyright year in README.md
• Update the copyright year in modified source codes.
• Update the version of @version tag in package-info.json
• Update the copyright year in package-info.java
• Update the version of @version tag in module-info.json
• Update the copyright year in module-info.java
• Add a @since tag to to package-info.java (1.0.0 and later)
• Add a @since tag to javadoc comments of new classes. (1.0.0 and later)

[Copilot]

Pull Request Overview

This PR updates version numbers and documentation as part of the release process for version 0.6.0. It updates the project version from 0.5.0 to 0.6.0 across all relevant files and documentation.

Key changes:

• Version bump from 0.5.0 to 0.6.0 in project configuration and documentation
• Updated Maven Central badge URLs to reflect the new version
• Updated @Version tags in JavaDoc comments

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
pom.xml	Updates project version from 0.5.0 to 0.6.0
README.md	Updates version references in dependency examples and Maven Central badge URLs
src/main/java/module-info.java	Updates @Version tag from 0.5 to 0.6
src/main/java/com/github/sttk/sabi/package-info.java	Updates @Version tag from 0.5 to 0.6

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