Implement K8sReporter for VirtualMCPServer status updates

[yrobla]

Add K8sReporter implementation that enables vMCP runtime to report operational status to VirtualMCPServer.Status subresource when running in Kubernetes. This completes the StatusReporter abstraction with both CLI (NoOpReporter) and Kubernetes modes.

Large PR Justification

This is an atomic PR, including test coverage. It cannot be split because it provides a complete and independent functionality.

Closes: #3149

[github-actions]

Large PR Detected

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## Large PR Justification

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[codecov]

Codecov Report

❌ Patch coverage is 59.11950% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.97%. Comparing base (e520544) to head (4968daf).

Files with missing lines	Patch %	Lines
pkg/vmcp/status/k8s_reporter.go	59.57%	54 Missing and 3 partials ⚠️
pkg/vmcp/status/factory.go	66.66%	5 Missing ⚠️
cmd/vmcp/app/commands.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           issue-3147    #3251      +/-   ##
==============================================
+ Coverage       56.96%   56.97%   +0.01%     
==============================================
  Files             352      354       +2     
  Lines           34978    35023      +45     
==============================================
+ Hits            19924    19954      +30     
- Misses          13396    13410      +14     
- Partials         1658     1659       +1     

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[Copilot]

Pull request overview

This PR implements K8sReporter to enable vMCP runtime to report operational status to VirtualMCPServer.Status subresource when running in Kubernetes. The implementation completes the StatusReporter abstraction pattern with automatic detection between CLI (NoOpReporter) and Kubernetes (K8sReporter) modes based on environment variables.

Changes:

• Added K8sReporter implementation with periodic status reporting to Kubernetes API
• Created factory pattern for automatic reporter selection based on environment
• Added comprehensive unit tests and E2E tests for status reporting functionality

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/vmcp/status/k8s_reporter.go	Core K8sReporter implementation with status update and lifecycle management
pkg/vmcp/status/k8s_reporter_test.go	Unit tests for K8sReporter functionality
pkg/vmcp/status/factory.go	Factory pattern for environment-based reporter selection
pkg/vmcp/status/factory_test.go	Unit tests for factory logic and environment detection
cmd/vmcp/app/commands.go	Integration of factory-based reporter creation in serve command
cmd/thv-operator/controllers/virtualmcpserver_deployment.go	RBAC permissions for status subresource updates
test/e2e/thv-operator/virtualmcp/virtualmcp_status_reporting_test.go	End-to-end tests validating status reporting in Kubernetes

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Large PR justification has been provided. Thank you!

[github-actions]

✅ Large PR justification has been provided. The size review has been dismissed and this PR can now proceed with normal review.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

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