fix: reload Rstack config without module cache

[chenjiahan]

This PR ensures repeated Rstack config loads re-evaluate the config instead of returning empty state from the ESM module cache. It enables fresh native loading and updates @rstackjs/load-config to v0.1.2 so config evaluation errors propagate without retrying.

Related Links

• https://github.com/rstackjs/load-config/releases/tag/v0.1.2

[coderabbitai]

📝 Walkthrough

Walkthrough

loadRstackConfig now passes fresh: true to loadConfig. A new fixture registers an app during module loading. The load-state test verifies two successful loads of the fresh configuration, then switches to another configuration and expects loading to reject while preserving state cleanup.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: reloading Rstack config without using the module cache.
Description check	✅ Passed	The description is directly related to the config reloading and fresh-loading changes in the PR.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/fix-fresh-config-loading

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