Add AS peers display to AS detail page

- Added GetASPeers method to database to fetch all peering relationships
- Updated AS detail handler to fetch and pass peers to template
- Added peers section to AS detail page showing all peer ASNs with their info
- Added peer count to the info cards at the top of the page
- Shows handle, description, and first/last seen dates for each peer

internal/routewatch/app_integration_test.go

@@ -291,6 +291,17 @@ func (m *mockStore) GetRandomPrefixesByLengthContext(ctx context.Context, maskLe
 	return m.GetRandomPrefixesByLength(maskLength, ipVersion, limit)
 }
 
+// GetASPeers mock implementation
+func (m *mockStore) GetASPeers(asn int) ([]database.ASPeer, error) {
+	// Return empty peers for now
+	return []database.ASPeer{}, nil
+}
+
+// GetASPeersContext mock implementation with context support
+func (m *mockStore) GetASPeersContext(ctx context.Context, asn int) ([]database.ASPeer, error) {
+	return m.GetASPeers(asn)
+}
+
 // UpsertLiveRouteBatch mock implementation
 func (m *mockStore) UpsertLiveRouteBatch(routes []*database.LiveRoute) error {
 	m.mu.Lock()