refactor(health): add dashboard overview and related drill-down

- Replace health monitor tabs with a dashboard layout
- Add related health drill-down for endpoint, model, and provider cards
- Render provider health as cards and hide empty monitors

apps/aether-gateway/src/control/route/admin/endpoints_families.rs

@@ -81,6 +81,16 @@ pub(super) fn classify_admin_endpoints_family_route(
             "admin:endpoints_health",
             false,
         ))
+    } else if method == http::Method::GET
+        && normalized_path == "/api/admin/endpoints/health/related"
+    {
+        Some(classified(
+            "admin_proxy",
+            "endpoints_health",
+            "health_related",
+            "admin:endpoints_health",
+            false,
+        ))
     } else if method == http::Method::GET
         && normalized_path.starts_with("/api/admin/endpoints/rpm/key/")
     {

apps/aether-gateway/src/control/route/public_support.rs

@@ -157,6 +157,7 @@ pub(super) fn classify_public_support_route(
                 | "/api/public/global-models"
                 | "/api/public/health/api-formats"
                 | "/api/public/health/models"
+                | "/api/public/health/related"
         )
     {
         let route_kind = match normalized_path {
@@ -168,6 +169,7 @@ pub(super) fn classify_public_support_route(
             "/api/public/global-models" => "global_models",
             "/api/public/health/api-formats" => "health_api_formats",
             "/api/public/health/models" => "health_models",
+            "/api/public/health/related" => "health_related",
             _ => "site_info",
         };
         Some(classified(