Add the thv-registry-api binary

[jhrozek]

Implements a standalone HTTP API server for accessing ToolHive registry data and deployed MCP server information in Kubernetes environments.

Features:
- RESTful API for registry metadata and server discovery
- MCP Registry API v0 compatibility (/v0/servers, /v0/publish endpoints)
- Separate Taskfile for registry API build and documentation tasks
- Health check, readiness, and version endpoints
- Structured logging and error handling

Fixes: #1745

[codecov]

Codecov Report

❌ Patch coverage is 36.71679% with 505 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.42%. Comparing base (f2b6bc3) to head (bd86df9).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/thv-registry-api/app/serve.go	0.00%	105 Missing ⚠️
.../thv-registry-api/internal/service/k8s_provider.go	0.00%	86 Missing ⚠️
cmd/thv-registry-api/api/v1/routes.go	63.43%	69 Missing and 14 partials ⚠️
...egistry-api/internal/service/mocks/mock_service.go	0.00%	60 Missing ⚠️
pkg/container/kubernetes/namespace.go	0.00%	51 Missing ⚠️
...gistry-api/internal/service/mocks/mock_provider.go	0.00%	47 Missing ⚠️
cmd/thv-registry-api/app/commands.go	0.00%	24 Missing ⚠️
cmd/thv-registry-api/internal/service/service.go	82.73%	18 Missing and 6 partials ⚠️
cmd/thv-registry-api/api/v1/server.go	69.38%	15 Missing ⚠️
cmd/thv-registry-api/main.go	0.00%	7 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1851      +/-   ##
==========================================
- Coverage   44.59%   44.42%   -0.17%     
==========================================
  Files         203      214      +11     
  Lines       25864    26613     +749     
==========================================
+ Hits        11534    11823     +289     
- Misses      13428    13867     +439     
- Partials      902      923      +21     

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[coveralls]

coverage: 41.118% (+1.0%) from 40.083%
when pulling abab72b on thv-registry-api
into b640a5f on main.

[dmartinol]

/lgtm apart from minor comments

[jhrozek]

/lgtm apart from minor comments

Thank you very much for the review, I addressed your comments in separate patches for easier review (we squash them during merge anyway).

I will see about getting you review privileges to not slow us down but in the meantime, I might need to get someone to rubber-stamp the PR once you verify your comments have been resolved.

[yrobla]

i added a pair of comments. requesting changes because of the confusing messages when configmap does not exist

[jhrozek]

i added a pair of comments. requesting changes because of the confusing messages when configmap does not exist

Thank you for the review, nice catches, please see the new patches (I added individual patches for easier review)

[dmartinol]

/lgtm

[jhrozek]

@yrobla let me know if the latest push fixed the comments you had 😄