⬆️ Bump llmDModelservice tracking from v0.4.15 to v0.4.16

[Copilot]

Description

Updates the upstream dependency tracking entry for llmDModelservice to the latest released tag (v0.4.16). Scope is intentionally limited to the generated upstream version ledger.

• Upstream version ledger
  • Updated docs/upstream-versions.md row for llmDModelservice from v0.4.15 to v0.4.16.
• Scope guardrail
  • No runtime behavior, chart pinning mode, or deployment logic changes (chartVersions.llmDModelservice remains auto).

| **llmDModelservice** | `v0.4.15` | ... |
→
| **llmDModelservice** | `v0.4.16` | ... |

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Not part of issue scope; this PR only updates upstream version tracking metadata.

Test Configuration

• Kubernetes version: N/A

Checklist

• My changes follows the style guidelines of this project
• I have performed a self-review of my own changes
• I confirm that a full ./setup/standup.sh -> run.sh -> ./setup/teardown.sh sequence completed successfully
• I confirm that pre-commit run was run and all checks passed
• I have updated the documentation accordingly

• Fixes [Upstream Update] llmDModelservice v0.4.15 -> v0.4.16 #1894