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

crates/aether-data/src/repository/usage/memory.rs

@@ -552,6 +552,16 @@ fn usage_matches_breakdown_summary_query(
             return false;
         }
     }
+    if let Some(model) = query.model.as_deref() {
+        if item.model != model {
+            return false;
+        }
+    }
+    if let Some(api_format) = query.api_format.as_deref() {
+        if item.api_format.as_deref() != Some(api_format) {
+            return false;
+        }
+    }
     if item
         .status_code
         .is_some_and(|status_code| query.exclude_status_codes.contains(&status_code))

crates/aether-data/src/repository/usage/postgres/mod.rs

@@ -4841,6 +4841,18 @@ WITH filtered_usage AS (
                 .push("\"usage\".provider_name = ")
                 .push_bind(provider_name.to_string());
         }
+        if let Some(model) = query.model.as_deref() {
+            builder.push(if has_where { " AND " } else { " WHERE " });
+            builder
+                .push("\"usage\".model = ")
+                .push_bind(model.to_string());
+        }
+        if let Some(api_format) = query.api_format.as_deref() {
+            builder.push(if has_where { " AND " } else { " WHERE " });
+            builder
+                .push("\"usage\".api_format = ")
+                .push_bind(api_format.to_string());
+        }
         push_postgres_usage_excluded_status_codes(
             &mut builder,
             &mut has_where,
@@ -4944,6 +4956,12 @@ ORDER BY request_count DESC, group_key ASC
         if query.provider_name.is_some() {
             return self.summarize_usage_breakdown_raw(query).await;
         }
+        if query.model.is_some() {
+            return self.summarize_usage_breakdown_raw(query).await;
+        }
+        if query.api_format.is_some() {
+            return self.summarize_usage_breakdown_raw(query).await;
+        }
         let Some(user_id) = query.user_id.as_deref() else {
             return self.summarize_usage_breakdown_raw(query).await;
         };
@@ -4966,6 +4984,8 @@ ORDER BY request_count DESC, group_key ASC
                     created_until_unix_secs: dashboard_utc_to_unix_secs(raw_end),
                     user_id: Some(user_id.to_string()),
                     provider_name: None,
+                    model: None,
+                    api_format: None,
                     exclude_status_codes: query.exclude_status_codes.clone(),
                     group_by: query.group_by,
                 })
@@ -4990,6 +5010,8 @@ ORDER BY request_count DESC, group_key ASC
                     created_until_unix_secs: dashboard_utc_to_unix_secs(raw_end),
                     user_id: Some(user_id.to_string()),
                     provider_name: None,
+                    model: None,
+                    api_format: None,
                     exclude_status_codes: query.exclude_status_codes.clone(),
                     group_by: query.group_by,
                 })

crates/aether-data/src/repository/usage/sqlite.rs

@@ -2490,6 +2490,18 @@ FROM "usage"
             "provider_name",
             query.provider_name.as_deref(),
         );
+        push_sqlite_usage_optional_text_filter(
+            &mut builder,
+            &mut has_where,
+            "model",
+            query.model.as_deref(),
+        );
+        push_sqlite_usage_optional_text_filter(
+            &mut builder,
+            &mut has_where,
+            "api_format",
+            query.api_format.as_deref(),
+        );
         push_sqlite_usage_excluded_status_codes(
             &mut builder,
             &mut has_where,