fix[nginx]: Use a larger buffer size for /v1a/status

[luislhl]

Motivation

We are receiving logs like this in Nginx:

2026/02/10 16:07:20 [warn] 20#20: *10712262 an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/2/02/0001378022 while reading upstream, client: <redacted>, server: localhost, request: "GET /v1a/status HTTP/1.1", upstream: "http://127.0.0.1:8080/v1a/status", host: "<redacted>"

Acceptance Criteria

• We should be able to set the buffers config in OpenAPI definition
• The automated generator of nginx.conf should read it and add in the config in the right endpoint
• We should increase the buffers for /v1a/status, which has a response size around 122kb

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	fix/nginx/status-buffer-size
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.70 m (-0.61%) Baseline: 1.71 m	1.54 m (90.55%)	2.06 m (82.82%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (246a56a) to head (22b9de9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1594      +/-   ##
==========================================
- Coverage   85.76%   85.71%   -0.05%     
==========================================
  Files         441      441              
  Lines       33829    33829              
  Branches     5285     5285              
==========================================
- Hits        29014    28998      -16     
- Misses       3800     3814      +14     
- Partials     1015     1017       +2     

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