refactor(shared): decompose model-capabilities into focused modules

src/shared/model-capabilities/index.ts

@@ -0,0 +1,9 @@
+export { getBundledModelCapabilitiesSnapshot } from "./bundled-snapshot"
+export { getModelCapabilities } from "./get-model-capabilities"
+export type {
+	GetModelCapabilitiesInput,
+	ModelCapabilities,
+	ModelCapabilitiesDiagnostics,
+	ModelCapabilitiesSnapshot,
+	ModelCapabilitiesSnapshotEntry,
+} from "./types"