feat(08-01): add pkg/dorks foundation (schema, loader, registry, executor)
- Dork schema with Validate() mirroring provider YAML pattern - go:embed loader tolerating empty definitions tree - Registry with List/Get/Stats/ListBySource/ListByCategory - Executor interface + Runner dispatch + ErrSourceNotImplemented - Placeholder definitions/.gitkeep and repo-root dorks/.gitkeep - Full unit test coverage for registry, validation, and runner dispatch
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