fix(docs): add event bus values examples

[FrankSpitulski]

Summary

• Add deploy/nats-event-bus example values for common, CSC, CPC, CPC-1, and CPC-2 installs.
• Update deployment docs to point at the shipped example values files.
• Correct the getting-started NKey generation command to match generate-nkeys.sh.

Root Cause

The docs referenced values-csc.yaml / values-cpc*.yaml layering, but the repository did not ship those example values files. Operators had to reverse-engineer required overrides from the chart defaults.

Validation

• Reproduced missing example files with file checks before the fix.
• helm template for CSC, CPC-1, and CPC-2 example value stacks.
• helm lint for CSC, CPC-1, and CPC-2 example value stacks.
• make test-helm.
• make check-license-headers.
• git diff --check.
• Adversarial subagent review; all reported findings resolved.

Known Existing Failure

• make check reaches unit tests, then fails in local/mqtt-client/internal/dummybms TestLoadScenarioAcceptsGeneratedExemplarCSV due to the existing dsx_exemplar.csv payload/schema mismatch. This branch does not touch schemas or local/mqtt-client.

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