update api-syncagent docs to 0.4.0

[cnvergence]

Summary by CodeRabbit

• Chores
  • Upgraded api-syncagent deployment to version 0.4.0 across configurations and installation scripts.
  • Standardized image tag to v0.4.0 in setup workflows.
  • Updated build environment to Go 1.25.1 for improved tooling compatibility.
• Documentation
  • Updated references to reflect api-syncagent version 0.4.0, ensuring consistency with deployment instructions.

[coderabbitai]

Walkthrough

Updates the api-syncagent Helm chart version in YAML and shell script references to 0.4.0, and adjusts Go module settings: upgrades Go to 1.25.1 and switches indirect dependency from kubebuilder/v4 to kubebuilder/v3 with updated versions.

Changes

Cohort / File(s)	Change Summary
api-syncagent HelmRelease version bump docs/kcp-api-syncagent/api-syncagent.yaml	Updated spec.chart.spec.version from 0.1.0 to 0.4.0.
Local setup script update docs/localhost-ingress-httpbinui/setup.sh	Updated Helm install/upgrade to use chart version 0.4.0 and image tag v0.4.0 (replacing 0.3.0).
Go module and dependencies go.mod	Changed Go version from 1.24.5 to 1.25.1; removed toolchain go1.25.1; replaced indirect sigs.k8s.io/kubebuilder/v4 v4.9.0 with sigs.k8s.io/kubebuilder/v3 v3.15.1.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

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📥 Commits

Reviewing files that changed from the base of the PR and between afcf7be and 04c6fc5.

⛔ Files ignored due to path filters (1)

• go.sum is excluded by !**/*.sum

📒 Files selected for processing (3)

• docs/kcp-api-syncagent/api-syncagent.yaml (1 hunks)
• docs/localhost-ingress-httpbinui/setup.sh (1 hunks)
• go.mod (2 hunks)

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[mirzakopic]

lgtm