fix issues with propagating server and transport on telemetry

[yrobla]

Closes: #1898

[Copilot]

Pull Request Overview

This PR fixes issues with propagating server name and transport type to telemetry middleware by ensuring the computed values are used instead of the raw flag values.

• Modifies server name computation to extract from image metadata when name flag is empty
• Updates middleware configuration to use computed serverName and transportType parameters
• Adds comprehensive test coverage for telemetry parameter computation logic

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
cmd/thv/app/run_flags.go	Fixes telemetry middleware configuration by computing server name from image metadata and using computed values for middleware setup
cmd/thv/app/run_flags_test.go	Adds test cases to validate server name extraction logic and transport type computation for telemetry middleware

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[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.94%. Comparing base (d951d8b) to head (6a6bf76).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/api/v1/workload_service.go	66.66%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1973      +/-   ##
==========================================
+ Coverage   47.93%   47.94%   +0.01%     
==========================================
  Files         233      233              
  Lines       29172    29176       +4     
==========================================
+ Hits        13983    13988       +5     
+ Misses      14162    14152      -10     
- Partials     1027     1036       +9     

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[danbarr]

I built from this branch. In the prometheus metrics I'm now seeing the server as expected, but transport is still empty.

toolhive_mcp_request_duration_seconds_count{mcp_method="tools/list",method="POST",otel_scope_name="github.com/stacklok/toolhive/pkg/telemetry",otel_scope_schema_url="",otel_scope_version="",server="osv",status="success",status_code="202",transport=""} 2

In the traces, the mcp.server.name value is showing up as message instead of osv, and mcp.transport is also empty.

[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

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[danbarr]

Confirmed the fix is working with my test cases.