docs: add development startup troubleshooting

[dashitongzhi]

Summary

• Add a development startup checklist to the contributing guide.
• Document quick validation commands for Docker, Compose config, service status, expected endpoints, and targeted logs.
• Help contributors troubleshoot local startup issues before changing application code.

Test Plan

• Ran git diff --check.
• Documentation-only change; no application runtime tests were needed.

Disclaimer Greptiles Reviews use AI, make sure to check over its work.

To better help train Greptile on our codebase, if the comment is useful and valid Like the comment, if its not helpful or invalid Dislike

To have Greptile Re-Review the changes, mention greptileai.

Greptile Summary

This PR adds startup troubleshooting guidance to the contributor docs. The main changes are:

• Development checklist for diagnosing local startup failures.
• Docker and Compose validation commands.
• Service status checks, endpoint probes, and targeted log commands.

Confidence Score: 5/5

Safe to merge with minimal risk.

Documentation-only change. Referenced commands match the existing development script, compose file, service names, ports, and health endpoints.

No files require special attention.

T-Rex Logs

What T-Rex did

• Reviewed the before evidence to confirm the base revision had no 'Development startup checklist' heading and lacked docker info, docker compose version, compose config, and curl health check entries.
• Reviewed the after evidence to confirm the head revision now includes the checklist and all required documented commands, plus path/script validation output.
• Confirmed that both artifacts contain the exact command, working directory, exit code, revision, documentation presence scan, git worktree validation, and non-fatal Docker availability context.
• Noted that two log artifacts were produced to capture the before and after evidence.

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "docs: add development startup troublesho..." | Re-trigger Greptile}

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[greptile-apps]

T-Rex pricing update — T-Rex was free through June 2026. Effective July 1, 2026, T-Rex adds 2 credits on top of the standard 1-credit review (3 total). T-Rex settings