v0.1.0

Added

• Initial release
• list_configs tool for listing available Jira configurations
• search_issues tool for JQL-based issue search
• get_issue tool for retrieving issue details with comments and attachments
• create_issue tool for creating new issues
• download_attachment tool for downloading attachments
• Multi-configuration support via JIRA_CONFIG_JSON environment variable
• Input validation for issue keys, project keys, and JQL queries
• ADF (Atlassian Document Format) conversion utilities
• Structured error responses with error codes