feat: unify installation model catalog

backend/src/settings/settings-store.ts

@@ -13,6 +13,7 @@ import type { AppConfig } from "../config.js";
 
 export interface Settings {
   workspace?: string;
+  /** Legacy input fields are ignored when loading/evaluating installation settings. */
   provider?: string;
   model?: string;
   thinking?: string;
@@ -37,7 +38,13 @@ export function loadSettings(cfg: AppConfig): Settings {
   try {
     const raw = readFileSync(cfg.settingsFile, "utf8");
     const parsed = JSON.parse(raw);
-    if (parsed && typeof parsed === "object") return parsed as Settings;
+    if (parsed && typeof parsed === "object") {
+      const value = parsed as Record<string, unknown>;
+      return {
+        ...(typeof value.workspace === "string" ? { workspace: value.workspace } : {}),
+        ...(typeof value.thinking === "string" ? { thinking: value.thinking } : {}),
+      };
+    }
     return {};
   } catch {
     return {};