exception-recommender release v0.3.0

Added

• Add io.giantswarm.application.audience and io.giantswarm.application.managed chart annotations for Backstage visibility.
• Push to the default catalog.
• Add example PolicyExceptionDraft CR under docs/cr so the CRD reference docs can show an example.

Changed

• Build the container image from the pre-built binary produced by architect/go-build instead of compiling inside the image, removing QEMU emulation from the multi-arch build.
• Resolve updated code linter findings.
• Use AppVersion for image tag defaulting.
• Migrate chart metadata annotations to OCI-compatible format.