Add a new "Component Layer Type" filter to the compound search filter on the Image page, allowing users to filter CVEs by base image vs application layers.

Implementation Details:

• Update compound search filter in ImagePage.tsx
• Add "Layer type" filter option under "Image component" category
• Two filter values: "Application" | "Base image"
• Generates query string: Component Layer Type:APPLICATION or Component Layer Type:BASE_IMAGE
• Add feature flag gating (ROX_BASE_IMAGE_MANAGEMENT)
• Follow existing compound search filter patterns

Acceptance Criteria:

• Filter appears in compound search dropdown under "Image component"
• Generates correct query string when selected
• Filter chip displays correctly with proper label
• Results update when filter is applied/removed
• Filter is hidden when feature flag is OFF