feat: Add DeveloperTools class to RelicApp

[nielsenko]

Description

Add a DeveloperTools class to RelicApp, accessible via app.developerTools. Provides reloadCount and isDevMode getters for hot-reload introspection. A private _Reloadable interface decouples DeveloperTools from RelicApp.

Also fixes hot-reload support for routes added via injectAt.

Related Issues

• Related: feat: Serverpod start command and hot-reload support serverpod#4788

Pre-Launch Checklist

• This update focuses on a single feature or bug fix.
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

Breaking Changes

• Includes breaking changes.
• No breaking changes.

Additional Notes

None.

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 73f8b674-962c-46ed-b405-63d92bfbf7d2

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

❌ Patch coverage is 65.21739% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.28%. Comparing base (69c7cf2) to head (99c2e54).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/relic_core/lib/src/router/relic_app.dart	60.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
- Coverage   91.45%   91.28%   -0.18%     
==========================================
  Files          97       97              
  Lines        3816     3832      +16     
  Branches     1943     1953      +10     
==========================================
+ Hits         3490     3498       +8     
- Misses        326      334       +8     

Flag	Coverage Δ
relic_core	91.01% <65.21%> (-0.20%)	⬇️
relic_io	93.33% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[nielsenko]

Disregard the lower coverage. The hot-reload tests are not currently counted in coverage.

[marcelomendoncasoares]

LGTM!