Document application chart lifecycle compatibility

[csandanov]

Some third-party application charts do not expose Wodby's conventional replica, naming, or backend-port controls. The public service-author documentation did not explain how to integrate those charts without weakening the existing multi-workload contract.

This change documents the explicit compatibility controls for per-workload replicas, chart-owned HPAs, unsupported nameOverride behavior, and public ports that must be rendered back into a chart.

Summary

• document workloads[].helm.replicas and workloads[].helm.managedReplicas, including validation and HPA ownership
• explain the deliberate helm.valueMappings.disableNameOverride opt-out and its selector requirements
• document named endpoint-port tokens for internal, public, effective, and protocol values
• explain redeployOnPublicPortChange and routeToPublicPort for dynamic TCP and UDP backend ports
• add all new fields to the service template reference and cross-link the detailed guidance

Validation

• mkdocs build --strict
• git diff --check

Rollout

Publish these docs after the corresponding service-manifest fields are available in the platform release.