feat: define dashboard model schema

src/lib/model/index.ts

@@ -0,0 +1,24 @@
+export {
+  DASHBOARD_SCHEMA_VERSION,
+  DashboardDocumentSchema,
+  dashboardDocumentJsonSchema,
+  type DashboardDocument,
+  type DashboardModule,
+  type DatasourceReference,
+  type MetricValue,
+  type ServiceEntry,
+  type ServiceGroup,
+  type Severity,
+  type StatusItem,
+  type StatusStrip,
+  type TelemetryCard,
+} from "./schema";
+export {
+  assertDashboardDocument,
+  formatValidationErrors,
+  isDashboardDocument,
+  validateDashboardDocument,
+  type DashboardValidationFailure,
+  type DashboardValidationResult,
+  type DashboardValidationSuccess,
+} from "./validation";