feat: add preset configuration system

[qJkee]

Presets let users write preset: CustomResource in their config to get a curated set of linters without manual enable/disable. Each preset is a named list of linter names; user enable/disable always overrides.

Two built-in presets:

• BuiltIn: the 21 current default linters (no behavior change)
• CustomResource: 24 linters tuned for CRD types (adds maxlength, minlength, statussubresource, statusoptional; removes nonpointerstructs)

Fork maintainers register custom presets by calling presets.DefaultRegistry().Register() in init() and blank-importing their package — same pattern as custom linters.

Fixes #255

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[JoelSpeed]

/ok-to-test