fix encoding of bytes in path params to be hex

[poszu]

Fixing invalid encoding of bytes path parameters in the node-service API. Previously they were encoded as comma-separated bytes like:

http://127.0.0.1:36637/proposal/10000/243,161,4,243,36,232,61,219,173,52,174,32,221,0,16,11,108,133,168,113,234,178,43,125,216,175,119,36,118,197,121,23

Now, they are encoded in hex:

http://127.0.0.1:34037/proposal/10000/b09edfc6bebe09f4642b99f4d67ae11d977195b75e9204e27d38318dac08daf

[codecov]

Codecov Report

Attention: Patch coverage is 64.06250% with 23 lines in your changes missing coverage. Please review.

Project coverage is 77.0%. Comparing base (4e3f10c) to head (285a595).
Report is 2 commits behind head on node-split-poc.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
api/node/models/models.go	42.8%	8 Missing and 4 partials ⚠️
api/node/client/client.go	44.4%	5 Missing ⚠️
api/node/client/client.gen.go	80.0%	3 Missing ⚠️
api/node/server/server.gen.go	80.0%	2 Missing ⚠️
api/node/server/server.go	83.3%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           node-split-poc   #6695     +/-   ##
================================================
- Coverage            77.2%   77.0%   -0.2%     
================================================
  Files                 387     387             
  Lines               53664   53691     +27     
================================================
- Hits                41429   41392     -37     
- Misses               9772    9829     +57     
- Partials             2463    2470      +7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.