fix: proxy /api to backend for eth_getBalance

[pthmas]

Summary

• getEthBalance calls GET /api?module=account&action=balance&address=... (no trailing slash)
• nginx only had location /api/ which doesn't match /api — the request fell through to the SPA catch-all, returning index.html instead of proxying to the backend
• Add location = /api exact-match block to proxy the Etherscan-compatible endpoint correctly

Summary by CodeRabbit

• Chores
  • Improved API request routing to ensure proper handling of API endpoints without trailing slashes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fbfe5f02-b67b-4619-a217-339306fc2523

📥 Commits

Reviewing files that changed from the base of the PR and between e1b3e31 and 1dfcdc6.

📒 Files selected for processing (1)

• frontend/nginx.conf

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📝 Walkthrough

Walkthrough

Added a new Nginx location block with exact-match for path /api that proxies requests to http://atlas-server:3000/api with header forwarding (Host, X-Real-IP, X-Forwarded-For). This complements the existing /api/ location block for deeper paths.

Changes

Cohort / File(s)	Summary
Nginx Configuration frontend/nginx.conf	Added exact-match location block for /api endpoint proxying to http://atlas-server:3000/api, forwarding Host, X-Real-IP, and X-Forwarded-For headers.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A hop through the config so clean and so bright,
A new route for /api set perfectly right,
No trailing slash needed, exact match will do,
The proxies all dancing, now routing true! ✨🔧

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding an Nginx rule to proxy /api requests to the backend for the eth_getBalance endpoint, which is the core purpose of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pthmas/fix-eth-balance

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