feat: Add DaemonSet deployment mode support

[lexfrei]

Description

Add optional DaemonSet deployment mode as an alternative to Deployment.

Why is this needed?

Running cloudflared as a DaemonSet (one pod per node) can help:

• Avoid ephemeral port exhaustion when multiple pods run on the same node
• Ensure consistent tunnel presence across all nodes
• Follow Cloudflare's recommendation of limiting instances per node

Implementation details

• Add daemonset.enabled flag in values.yaml (default: false)
• Create conditional logic to deploy either Deployment or DaemonSet
• Ensure all relevant settings work with both modes
• Add corresponding tests

Reference

• Upstream PR: Optional Daemonset deployment cloudflare/helm-charts#87
• Cloudflare docs: https://developers.cloudflare.com/cloudflare-one/connections/connect-networks/deploy-tunnels/system-requirements/#recommendations

Acceptance Criteria

• DaemonSet template created (or conditional deployment)
• Values.yaml updated with daemonset options
• Tests added for both modes
• Documentation updated with use cases

[lexfrei]

Closing in favor of grouped issues for better project management