Model selection UI disappears for AI-native features after switching from Online to Offline license
## Summary
On GitLab 18.10 (Premium), switching from an Online license with BYOM enabled to an Offline license (also Premium, same seat count) causes the "Model" selection UI for AI-native features to disappear, even though self-hosted models remain configured.
## Steps to reproduce
1. Start from GitLab 18.10, Premium, with an Online license that includes BYOM.
2. Go to Admin > GitLab Duo > Model selection.
3. In the "Self-hosted models" tab, configure several AWS Bedrock models (e.g. Anthropic Claude/Claude Sonnet via Bedrock).
4. Assign those models to Code Suggestions and GitLab Duo Chat.
5. Replace the Online license with an Offline license (same plan: Premium, same seat count).
6. Go back to Admin > GitLab Duo > Model selection.
## Expected behavior
- The "Self-hosted models" tab remains available and shows the previously configured Bedrock models.
- In the "AI-native features" tab, the "Model" column allows selecting from the available self-hosted models (or at least displays the previously assigned models).
## Actual behavior
- The "Self-hosted models" tab is still visible and lists the Bedrock models correctly.
- However, in the "AI-native features" tab, the "Model" column is blank and there is no UI to select or assign any model to Code Suggestions or GitLab Duo Chat.
- This behavior started only after applying the Offline license; with the Online license, model selection worked as expected.
## Environment
- GitLab: 18.10
- Edition: Premium
- License type history:
- Previously: Online license (Premium, BYOM enabled)
- Currently: Offline license (Premium, same seat count)
- Self-hosted models: AWS Bedrock (Anthropic Claude / Claude Sonnet, etc.)
## Additional information
- Subscription screen confirms the current license is Premium Offline.
- Self-hosted models list is intact (names, model family, model identifier), but the AI-native features can no longer reference them.
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