Release: NX9-Auth v0.3.0

docs/REFRACTOR_REPORT.md

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+# Refactor Report
+
+## Summary
+
+The runtime layer was refactored to restore the missing application startup API and make the project build successfully again.
+
+## What changed
+
+- Added a runtime application container in [src/runtime/application.rs](../src/runtime/application.rs) with lifecycle support and shared runtime state.
+- Added an application builder in [src/runtime/builder.rs](../src/runtime/builder.rs) so the binary can construct the runtime through the expected builder pattern.
+- Added lightweight runtime metrics support in [src/runtime/metrics.rs](../src/runtime/metrics.rs).
+- Updated the runtime module exports in [src/runtime/mod.rs](../src/runtime/mod.rs) to expose the newly introduced components.
+- Set the Rust toolchain to the installed stable toolchain so builds no longer fail due to an unconfigured default toolchain.
+
+## Verification
+
+The changes were verified with:
+
+```bash
+export RUSTUP_TOOLCHAIN=stable-x86_64-unknown-linux-gnu && cargo build --release
+```
+
+Result:
+
+- Build completed successfully
+- Output ended with: `Finished release profile [optimized] target(s) in 1m 16s`
+
+## Notes
+
+This refactor focused on restoring the expected runtime API surface with minimal, compatible implementations so the existing application entrypoint and build pipeline continue to function.