fix: simplify docker-compose.yml for api compare tests

[hanabi1224]

Summary of changes

Changes introduced in this pull request:

• merge forest-index-backfill into forest-rpc-ready

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• This pull request is based on an issue that a maintainer has accepted (see Before Opening a Pull Request).
• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Refactor
  • Integrated index backfill into the RPC readiness process.
  • Simplified service startup by removing the standalone index backfill service and redundant dependencies.

[coderabbitai]

Walkthrough

Changes

API comparison readiness

Layer / File(s)	Summary
Run index backfill during RPC readiness scripts/tests/api_compare/docker-compose.yml	forest-rpc-ready extracts the snapshot epoch and runs forest-cli index backfill. The standalone forest-index-backfill service is removed.
Align API comparison dependencies scripts/tests/api_compare/docker-compose.yml	api-compare and api-compare-gateway no longer depend directly on forest-index-backfill.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: lesnyrumcajs, sudo-shashank

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: simplifying the Docker Compose configuration for API comparison tests.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch hm/simplify-api-compare-docker-compose

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch hm/simplify-api-compare-docker-compose

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_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.13%. Comparing base (81f6cba) to head (dabf33f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

see 6 files with indirect coverage changes

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