feat(doctor): add local setup checks

[jongio]

Adds azd app doctor as a read-only setup checklist. It checks project discovery, azure.yaml parsing, service project paths, required tools, declared ports, and dashboard state with text and JSON output.

Closes #462

Validation: go test ./src/cmd/app/commands -run 'TestDoctor'

[github-actions]

🚀 Website Preview

Your PR preview is ready!

📎 Preview URL: https://jongio.github.io/azd-app/pr/554/

This preview will be automatically cleaned up when the PR is closed.

[codecov]

Codecov Report

❌ Patch coverage is 28.49162% with 128 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.94%. Comparing base (dd47eb3) to head (8cf8268).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/doctor.go	28.49%	123 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #554      +/-   ##
==========================================
- Coverage   61.10%   60.94%   -0.16%     
==========================================
  Files         224      225       +1     
  Lines       28989    29168     +179     
==========================================
+ Hits        17713    17777      +64     
- Misses      10081    10188     +107     
- Partials     1195     1203       +8     

Flag	Coverage Δ
unittests	60.94% <28.49%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cli/src/cmd/app/commands/doctor.go	28.49% <28.49%> (ø)

... and 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

🚀 Test This PR

A preview build (0.20.0-pr554) is ready for testing!

🌐 Website Preview

Live Preview: https://jongio.github.io/azd-app/pr/554/

One-Line Install (Recommended)

PowerShell (Windows):

iex "& { $(irm https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/install-pr.ps1) } -PrNumber 554 -Version 0.20.0-pr554"

Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/install-pr.sh | bash -s 554 0.20.0-pr554

Uninstall

When you're done testing:

PowerShell (Windows):

iex "& { $(irm https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.ps1) } -PrNumber 554"

Bash (macOS/Linux):

curl -fsSL https://raw.githubusercontent.com/jongio/azd-app/main/cli/scripts/uninstall-pr.sh | bash -s 554

---

Build Info:

• Version: 0.20.0-pr554
• Commit: 8cf8268
• Release: View pre-release

What to Test:
Please review the PR description and test the changes described there.