fix: preserve user-defined fileservice cache fields

[loveRhythm1990]

Summary

• normalize operator-generated fileservice cache tables to map[string]interface{} at the source
• preserve non-conflicting user-defined cache fields while keeping operator values authoritative on conflicts
• add a DN ConfigMap regression test based on real TOML decoding
• update fileservice unit expectations for the normalized cache representation
• ignore local docs/troubleshooting/ and docs/draft directories

Testing

• go test ./api/...
• KUBEBUILDER_ASSETS="/Users/lr90/Library/Application Support/io.kubebuilder.envtest/k8s/1.24.1-darwin-amd64" CGO_ENABLED=0 go test ./pkg/...
• CGO_ENABLED=0 go vet ./api/... ./pkg/...
• make check-license
• git diff --check

Fixes #602

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[Copilot]

Pull request overview

Fixes deep merging of user-defined fileservice cache settings while preserving operator precedence.

Changes:

• Normalizes generated cache tables to map[string]interface{}.
• Adds DN regression coverage using decoded TOML.
• Updates unit expectations and ignores local documentation drafts.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
.gitignore	Ignores local documentation directories.
pkg/controllers/common/fileservice.go	Normalizes generated cache maps.
pkg/controllers/common/fileservice_test.go	Updates expected cache types.
pkg/controllers/dnset/resource_test.go	Verifies user fields survive controller merging.

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