#19578: docs(tr): add Turkish translation for Getting Started

## Summary This PR adds a Turkish translation for the Getting Started documentation page. ## Why Turkish-speaking users can onboard faster with localized docs, especially in first setup steps. ## Scope - Added Turkish translation for Getting Started page at docs/tr-TR/start/getting-started.md - Kept original English docs unchanged - Preserved key terminology where needed (Gateway, Session, Skill) ## Notes - This is the first small localization PR. - If accepted, follow-up PRs will cover FAQ and Onboarding in the same format. <!-- greptile_comment --> <h3>Greptile Summary</h3> Added Turkish (`tr-TR`) translation for the Getting Started documentation page. The translation accurately conveys the original content while preserving key technical terms (`Gateway`, `Session`, `Skill`, `Control UI`, `Dashboard`) and maintaining the same structure, formatting elements (MDX components like `<Info>`, `<Steps>`, `<Tooltip>`), and code examples as the English version. This is the first localization contribution for Turkish speakers. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with no risk - Translation-only PR that adds a new file without modifying any existing code or documentation. The Turkish translation accurately reflects the English source, preserves technical terminology appropriately, and maintains all structural elements. No logic changes, no dependencies affected, and follows the pattern established by existing localizations (`ja-JP`, `zh-CN`). - No files require special attention _{Last reviewed commit: e406a57} <!-- greptile_other_comments_section --> _{(3/5) Reply to the agent's comments like "Can you suggest a fix for this @greptileai?" or ask follow-up questions!} <!-- /greptile_comment -->