docs(example): align configuration reference for BUG-032

[sbalabanov]

Summary

Intent

• Fix BUG-032 by replacing stale example configuration names and defaults with the accepted schema.

Changes

• Document every supported storage, repository, and service field with its nesting, validation, and default behavior.
• Keep the runnable YAML aligned with the full current schema and validate it with a strict parsing test.

Test Plan

• go test ./config ./example
• ./tools/bazel test //config:config_test //example:example_test
• make build
• make test
• make gazelle
• aifx verify

Revert Plan

• Revert this PR to restore the previous example documentation and remove the published-config validation test.

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