feat: Determine default metro from profile

[jedevc]

So it needs to be manually specified less on create.

The best mechanism for doing with was allowing context.Context on the Fields calls.

[Copilot]

Pull request overview

This PR updates the resource field-schema pipeline to be context-aware and uses the active config profile to infer a default metro (so users need to manually specify a metro less often during create/run flows).

Changes:

• Extend resource.Resource.Fields to accept context.Context and update call sites/implementations accordingly.
• Add Profile.DefaultMetro + GetDefaultMetro() and use it to default MetroName (and run --metro) from the current profile.
• Adjust patch/visual-edit behavior to better preserve defaults during create flows.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tools/gendocs/mdx.go	Updates doc generation to call Fields with a context (currently uses context.Background()).
tools/gendocs/man.go	Updates manpage generation to call Fields with a context.
internal/resource/value/compare.go	Adds value.IsZero helper for zero-value detection.
internal/resource/tui/panel_list.go	Threads panel context into Fields calls.
internal/resource/tui/panel_detail.go	Threads panel context into Fields calls.
internal/resource/testing/resource.go	Updates test resource to the new Fields(ctx) signature.
internal/resource/sandbox.go	Passes caller context into Fields when adding to sandbox.
internal/resource/resource.go	Changes Resource.Fields interface to Fields(ctx context.Context).
internal/resource/patch/visual_test.go	Updates tests for the new Fields(ctx) signature.
internal/resource/patch/visual.go	Changes create/edit visual patch retention rules (defaults vs removals).
internal/resource/patch/patch.go	Changes patch generation to preserve non-zero defaults (needs scoping to create).
internal/resource/cmd/sort.go	Passes command context into Fields for sorting/validation.
internal/resource/cmd/resolve.go	Passes command context into Fields during resolution.
internal/resource/cmd/printers.go	Passes command context into Fields for all output formats.
internal/resource/cmd/cmd_test.go	Updates tests to pass context into Fields.
internal/resource/cmd/cmd.go	Uses Fields(ctx) and moves required-field validation before dry-run printing.
internal/config/profile.go	Adds DefaultMetro and GetDefaultMetro() helper.
internal/cmd/volumes.go	Defaults MetroName from current profile during field generation.
internal/cmd/services.go	Defaults MetroName from current profile during field generation.
internal/cmd/run.go	Makes --metro optional and falls back to profile default when absent; uses Fields(ctx).
internal/cmd/profile.go	Updates to Fields(ctx) signature.
internal/cmd/metros.go	Updates to Fields(ctx) signature.
internal/cmd/instances.go	Defaults MetroName from current profile during field generation.
internal/cmd/images.go	Updates to Fields(ctx) signature.
internal/cmd/certificates.go	Defaults MetroName from current profile during field generation.
internal/cmd/any.go	Updates to Fields(ctx) signature and threads ctx to underlying resource.

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[nderjung]

Thanks!

Reviewed-by: Alexander Jung alex@unikraft.com
Approved-by: Alexander Jung alex@unikraft.com