release(aisix-cp): 0.4.0

[jarvis9443]

Release the public aisix-cp chart at 0.4.0.

• Bump version and appVersion to 0.4.0; regenerate README.md.
• Version-only release sync: the source-of-truth chart (control-plane/helm/aisix-cp) had no functional changes since 0.3.1, so no template/values deltas are ported this cycle.
• Preserves the public adaptations: docker.io registries, tag: "" → .Chart.AppVersion, always-emit api.dpImage default → docker.io/api7/aisix:<appVersion>, and README.md.

helm lint clean; helm template renders aisix-cp-{api,dpm,ui}:0.4.0 and AISIX_CLOUD_DP_IMAGE=docker.io/api7/aisix:0.4.0, with the dpm /healthz probes intact.

Merging publishes aisix-cp-0.4.0 to https://charts.api7.ai. The pinned images (docker.io/api7/aisix:0.4.0 and docker.io/api7/aisix-cp-{api,dpm,ui}:0.4.0) are already published.

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 19d2da2 and 4ae89be.

📒 Files selected for processing (2)

• charts/aisix-cp/Chart.yaml
• charts/aisix-cp/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-aisix-cp-0.4.0

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