chore(chart,docs): fix NOTES.txt ingress key + drop duplicate secrets block

[buremba]

Summary

Two CodeRabbit follow-ups from PR #882:

1. charts/lobu/templates/NOTES.txt referenced .Values.ingress.host (singular), but the chart's values schema uses .Values.ingress.hosts (array). Fresh installs rendered the install URL as https:// with an empty host. Now reads from index .Values.ingress.hosts 0 when both ingress.enabled is true and at least one host is set, falling through to the port-forward hint otherwise.

2. packages/landing/.../kubernetes.mdx had the same kubectl create secret block twice. The second copy is removed and replaced with a back-reference to the earlier section.

Verification

```
$ helm install --dry-run --debug --generate-name charts/lobu \
--set ingress.enabled=true --set 'ingress.hosts={app.example.com}' | grep 'Application URL' -A 1
Application URL:
https://app.example.com

$ helm install --dry-run --debug --generate-name charts/lobu \
--set ingress.enabled=false | grep 'Application URL' -A 1
Application URL:
kubectl port-forward svc/lobu-...-app 8787:8787
```

Test plan

• make build-packages clean
• make typecheck clean
• Helm renders correctly for both ingress.enabled=true and ingress.enabled=false

Summary by CodeRabbit

• Documentation

  • Updated Kubernetes Helm deployment guide with clarified guidance on required Kubernetes Secrets handling during installation.

• Improvements

  • Helm chart NOTES template now intelligently displays the application URL only when ingress is enabled and configured with valid hosts.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The PR updates the Helm chart NOTES template to render ingress application URLs from a list of configured hosts rather than a single host value, and clarifies in the Kubernetes deployment documentation that required Secrets must pre-exist in the target namespace before chart installation.

Changes

Kubernetes Deployment Configuration

Layer / File(s)	Summary
Helm NOTES ingress hosts rendering charts/lobu/templates/NOTES.txt	The "Application URL" output now requires both ingress.enabled and a non-empty ingress.hosts list, selecting the first host entry to format the URL instead of using a single ingress.host value.
Kubernetes secret pre-existence requirements packages/landing/src/content/docs/deployment/kubernetes.mdx	Deployment documentation now explicitly states that the lobu-db and lobu-secrets Kubernetes Secrets must already exist in the target namespace before chart installation, removing the prior inline instruction block for creating those secrets.

Possibly related PRs

• lobu-ai/lobu#882: Directly modifies the same NOTES template ingress host handling logic that this PR updates.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A chart that hosts ingress with grace,
Selecting URLs from the list's first place,
Secrets pre-made, no dance required,
Kubernetes paths now clarified and fired,
Deploy with clarity, no surprises in sight!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the two main changes: fixing the NOTES.txt ingress key reference and removing duplicate secrets documentation block.
Description check	✅ Passed	The description includes a clear summary of both changes, verification steps with command outputs, and a comprehensive test plan covering the required checks.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/chart-notes-and-docs-polish

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