feat: unify installation model catalog

backend/src/routes/meta.ts

@@ -1,10 +1,8 @@
 import { readdirSync } from "node:fs";
 import { join } from "node:path";
 import type { FastifyInstance } from "fastify";
-import type { PiModel } from "../pi/list-models.js";
 import { isPrincipalContext, requirePermission } from "../auth/authorization.js";
-
-export type ListModelsFn = () => Promise<PiModel[]>;
+import type { RuntimeModelCatalog } from "../models/runtime-model-catalog.js";
 
 /**
  * List YAML workspace configs found in <harnessDir>/workspaces/*.yaml.
@@ -25,20 +23,17 @@ export function listWorkspaces(harnessDir: string): { name: string; file: string
 
 export function metaRoutes(
   app: FastifyInstance,
-  deps: { harnessDir: string; listModels?: ListModelsFn },
+  deps: { harnessDir: string; modelCatalog: RuntimeModelCatalog },
 ): void {
   app.get("/models", async (request, reply) => {
     if (!isPrincipalContext(requirePermission(request, reply, "session.use"))) return reply;
-    const fn = deps.listModels ?? (async () => []);
-    try {
-      return { models: await fn() };
-    } catch (error) {
-      app.log.warn({
-        component: "pi-model-list",
-        errorType: error instanceof Error ? error.name : typeof error,
-      }, "Pi model listing failed");
-      // Graceful fallback: Pi may not be running; don't crash the server.
-      return { models: [] as PiModel[] };
-    }
+    return {
+      models: deps.modelCatalog.sessionModels().map((entry) => ({
+        provider: entry.provider,
+        id: entry.model,
+        name: entry.label,
+        reasoning: entry.session?.reasoning ?? false,
+      })),
+    };
   });
 }