Container specific log reading

[Ghostbird]

First of all, once again apologies that I haven't discussed this, but there is an issue #150 this time. So I'm improving.

Background

Previously, Kubeview’s pod log viewer did not support selecting logs for individual containers within a pod. This caused issues for users with multi-container pods, as described in #150:

“I do wonder what I should expect when I click pod logs on a pod with multiple containers. Does it just aggregate the logs for all containers? What if I want to see logs for an individual container in that pod? It seems like that should be possible, but I don't see a way to do that.”

User Story

As a Kubeview user working with pods that have multiple containers,
I want to be able to view logs for a specific container within a pod,
So that I can monitor each container independently without errors.

Approach

• Replaced the old “Pod Logs” button in the UI with a “Container Logs” button for each container in the side panel.
• The logs dialog now opens for a specific container, not just the pod as a whole.
• The backend API and log fetching logic were updated to now only support container-specific log retrieval.

Screenshots

Before:

After:

Potential rework

I'm not sure about the UI. It's functional, but it's a breaking change. I'm no UI/UX expert, so feel free to suggest another approach.

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Closes #150.