fix: update remaining code for flattened CLI children

[RealZST]

Summary

Follow-up to #12 — fixes all remaining code that treated CLI children as hidden/nested after flattening.

Counts & Filters

• Remove cli_parent_id filters in overview activity, agent extension counts, and CLI status command
• Stale pack filter auto-clears when pack no longer exists

Audit

• Each extension gets its own audit entry (remove child→parent merging in groupKeyMap and parentIdMap)
• "View Extension" navigates via groupKey for precise targeting (no longer lands on CLI parent for same-named children)
• Hook names display in friendly format matching Extensions page

Backend

• CLI toggle no longer cascades to children server-side (frontend handles cascade)
• Audit rules no longer skip CLI children — all extensions audited independently
• Remove child_permissions aggregation in audit service

Table

• Default sort set to name ascending (was unsorted)

Test plan

• Run audit → verify each extension has its own audit result and trust score
• Verify audit count numbers match (N scanned = N results)
• Click "View Extension" on a CLI child skill in audit → verify it opens the correct detail panel
• Check overview activity → verify CLI child skills appear
• Check agent detail page → verify extension counts include CLI children
• Toggle CLI parent → verify children still cascade (frontend-driven)
• Verify hook names in audit match Extensions page format
• Restart app → verify default sort is by name A-Z

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