refactor(node): standardize node-controller deployment structure

[bxy4543]

This commit refactors the node-controller deployment directory to align with the standardized deployment structure used across Sealos services, following the pattern established by account-controller.

Major changes:

• Rename chart directory from 'node' to 'node-controller' for consistency
• Remove deprecated 'drop' directory and manifest-based deployment
• Consolidate RBAC configuration into a single rbac.yaml file
• Update entrypoint script to use Helm resource adoption instead of kubectl delete
• Implement Issuer + Certificate pattern for TLS certificate management
• Disable metrics by default to reduce resource consumption
• Add comprehensive README.md with deployment guide and usage examples
• Standardize naming conventions across all templates (node → node-controller)
• Update Kubefile to reference the renamed entrypoint script
• Add imagePullPolicy and fullnameOverride to values.yaml

Deployment improvements:

• Resource adoption mechanism for seamless upgrades from legacy deployments
• Unified Helm chart structure following account-controller pattern
• Enhanced security with Issue + Cert approach instead of kube-proxy-rbac
• Cleaner directory structure without manifest files

Documentation:

• Complete README.md with quick start, configuration reference, and troubleshooting
• Clear usage examples for common deployment scenarios

This refactor maintains backward compatibility through Helm resource adoption while providing a cleaner, more maintainable deployment structure.

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

Conflicts:

controllers/node/deploy/charts/node/templates/configmap.yaml # controllers/node/deploy/drop/deploy.yaml

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