feat: Add NetEvolve.HealthChecks.CouchDb health check implementation

[Copilot]

What does this PR do?

Implements health check support for CouchDb using the MyCouch client library.

Core Implementation:

• CouchDbHealthCheck - Verifies database connectivity via HeadAsync() with configurable timeout
• CouchDbOptions - Configuration with connection string and timeout (100ms default)
• CouchDbConfigure - Validates configuration including connection string presence and timeout range
• DependencyInjectionExtensions - Registration with default tags ["couchdb", "nosql"]

Key Technical Decisions:

• Uses Stopwatch for timeout tracking instead of WithTimeoutAsync due to MyCouch API constraints
• Parses connection string URI to extract server and database for DbConnectionInfo constructor
• Connection string format: http://server:port/database

Test Coverage:

• Unit tests: DI extensions, options validation, configuration binding, health check logic
• Integration tests: TestContainers setup with healthy/degraded/unhealthy scenarios

Example Usage:

// Configuration-based
builder.Services.AddHealthChecks()
    .AddCouchDb("mydb");

// Builder-based
builder.Services.AddHealthChecks()
    .AddCouchDb("mydb", options => {
        options.ConnectionString = "http://localhost:5984/mydb";
        options.Timeout = 5000;
    });

Why is it important?

Enables health monitoring for CouchDb databases in .NET applications, following the established health check pattern used across the repository.

Related issues

• Closes #[issue_number]

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• analytics.localstack.cloud
  • Triggering command: /opt/code/localstack/.venv/bin/python -m localstack.runtime.main (dns block)
• api.localstack.cloud
• assets.localstack.cloud
• localhost.localstack.cloud
• s3.localhost.localstack.cloud
• westus-0.in.applicationinsights.azure.com
  • Triggering command: /home/REDACTED/work/healthchecks/healthchecks/tests/NetEvolve.HealthChecks.Tests.Integration/bin/Debug/net9.0/NetEvolve.HealthChecks.Tests.Integration --internal-msbuild-node /tmp/cf609e6a6b8441d5b1d830a9cd6df35d (dns block)
  • Triggering command: /home/REDACTED/work/healthchecks/healthchecks/tests/NetEvolve.HealthChecks.Tests.Integration/bin/Debug/net8.0/NetEvolve.HealthChecks.Tests.Integration --internal-msbuild-node /tmp/3c282b53f3624098bec8a79a35ecb109 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>NetEvolve.HealthChecks.CouchDb</issue_title>
<issue_description>### Project Name

CouchDb

Project Description

Contains HealthChecks for CouchDb, based on the nuget packages MyCouch.

TestContainer Package Required?

Yes

TestContainer Package Name

Testcontainers.CouchDb

Required NuGet Dependencies

MyCouch

Validation Steps

• Create project structure in src/NetEvolve.HealthChecks.<ProjectName>/
• Add project to solution (dotnet sln HealthChecks.slnx add)
• Add project reference to Test projects
• Add required NuGet packages to Directory.Packages.props
• Follow naming conventions from ADR decisions
• Create README.md based on other projects
• Create unit test folder in tests/NetEvolve.HealthChecks.Tests.Unit/<ProjectName>/
• Create integration test folder in tests/NetEvolve.HealthChecks.Tests.Integration/<ProjectName>/
• Add project reference to the solution file
• Add project reference to existing test projects
• Add TestContainer package if specified
• Restore NuGet packages (dotnet restore HealthChecks.slnx)
• Build the solution (dotnet build HealthChecks.slnx --no-restore)
• Run tests for the new project (dotnet test HealthChecks.slnx --no-build)
• Verify all tests pass successfully (>80% coverage recommended)
• Comment on issue with build/test results
• Create pull request linking to this issue

Additional Notes

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes NetEvolve.HealthChecks.CouchDb #1030

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (95319df) to head (b637764).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #1069       +/-   ##
==========================================
- Coverage   95.43%       0   -95.44%     
==========================================
  Files         217       0      -217     
  Lines        3678       0     -3678     
  Branches      630       0      -630     
==========================================
- Hits         3510       0     -3510     
+ Misses        120       0      -120     
+ Partials       48       0       -48     

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