Filter child DIDs from DID replicas view

Description

The DID Replicas view currently shows RSE mappings for child DIDs. This creates unnecessary clutter and confusion. The view should be filtered to show only the RSE mappings for the DID itself, excluding child DID-to-RSE mappings.

Current Behavior

• Replicas view shows RSE mappings for parent DID
• Also displays RSE mappings for all child DIDs
• Creates a cluttered and potentially confusing view

Proposed Solution

• Filter the replicas view to show only parent DID's direct RSE mappings
• Exclude child DID RSE mappings from the display
• Potentially add an option to toggle child DID visibility if needed

Implementation Details

1. Modify the replicas query/filter logic
2. Ensure only parent-level RSE mappings are displayed
3. Consider adding a toggle for users who need to see child mappings
4. Update any related documentation

Acceptance Criteria

• Replicas view shows only parent DID RSE mappings by default
• Child DID RSE mappings are filtered out
• Performance is not negatively impacted
• Clear indication of what data is being displayed

Parent Issue

• #621