feat: unify installation model catalog

backend/test/workspaces-catalog.test.ts

@@ -7,7 +7,7 @@ import {
 } from "../src/workspaces/catalog.js";
 
 const descriptor = parseWorkspaceYaml(`workspace:
-  schema_version: 3
+  schema_version: 4
   id: psd
   name: Policlinico San Donato
   description: Clinical warehouse
@@ -17,10 +17,6 @@ dwh:
   database: postgres
   schema: datawarehouse
   supported_transports: [rest_api]
-semantic_index:
-  vector_store: { engine: qdrant, collection: psd, dimensions: 1024, distance: cosine }
-  embedding: { provider: ollama_internal, model: qwen3-embedding:0.6b, dimensions: 1024 }
-llm_policy: { allowed: [zai/glm-5.2] }
 `);
 
 test("parses the strict ordered root catalog", () => {