Pod Restructuring: Create "Multi-Container Pods" documentation page

[Caesarsage]

This is an feature Request

What would you like to be added
Restructuring https://kubernetes.io/docs/concepts/workloads/pods

Create new page /docs/concepts/workloads/pods/multi-container-pods/ covering:

• Multi-container design patterns (sidecar, ambassador, adapter)
• Ephemeral containers
• Intra-pod communication mechanisms (localhost, shared volumes)
• Resource sharing and container coordination
• Best practices and anti-patterns
• Practical examples for each pattern

Why is this needed
Multi-container patterns are important architectural concepts but currently under-documented. Users need authoritative guidance for design decisions.

Comments
Related to issue #38867 Pod documentation restructure.
Complements existing init/sidecar container docs with pattern-focused guidance.

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[lmktfy]

We should mention ephemeral containers in that page, too.

[Caesarsage]

We should mention ephemeral containers in that page, too.

added to the description