Add Svarog table/field admin UI with inline field editor
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Introduces a split-panel field management UI within the Svarog Tables admin console: a fields list panel (SvarogFieldsPanel) with type/constraint badges, and an inline field editor (SvarogTableFormWrapper) with a 3-column card layout, field ordering via ui:order, and a custom InvertedMandatoryCheckbox widget to handle IS_NULL's inverted mandatory semantics.
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Also adds SvarogTablePreview for inline table metadata editing, extracts shared logic into svarogTableUtils, and extends GenericForm with additionalWidgets and uiSchemaOverride props. Export produces a DbDataArray diff preview via Monaco, correctly reflecting field additions, deletions, and edits without showing the table record as a spurious change. Closing the modal with pending unsaved changes prompts a SweetAlert2 confirmation before discarding.