fix(frontend): add HealthStatus type to api.ts for TypeScript compilation

The Server interface in api.ts was missing the health field and
HealthStatus interface that were added to contracts.ts. This caused
TypeScript compilation errors in ServerCard.vue and Dashboard.vue.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: technicalpickles

frontend/src/types/api.ts

@@ -5,6 +5,15 @@ export interface APIResponse<T = any> {
   error?: string
 }
 
+// Health Status types (unified across all interfaces)
+export interface HealthStatus {
+  level: 'healthy' | 'degraded' | 'unhealthy'
+  admin_state: 'enabled' | 'disabled' | 'quarantined'
+  summary: string
+  detail?: string
+  action?: 'login' | 'restart' | 'enable' | 'approve' | 'view_logs' | ''
+}
+
 // Server types
 export interface Server {
   name: string
@@ -27,6 +36,7 @@ export interface Server {
   oauth_status?: 'authenticated' | 'expired' | 'error' | 'none'
   token_expires_at?: string
   user_logged_out?: boolean // True if user explicitly logged out (prevents auto-reconnection)
+  health?: HealthStatus // Unified health status calculated by the backend
 }
 
 // Tool Annotation types