fix(instrumentation): await getSettings() — property access on Promise (#316 follow-up)

getSettings() is declared async so calling it without await left
settings as a Promise<Record<string, unknown>>, causing 4 TS errors
when accessing settings.modelAliases in the alias restore block.

src/instrumentation.ts

@@ -52,7 +52,7 @@ export async function register() {
     try {
       const { getSettings } = await import("@/lib/db/settings");
       const { setCustomAliases } = await import("@omniroute/open-sse/services/modelDeprecation.ts");
-      const settings = getSettings();
+      const settings = await getSettings();
       if (settings.modelAliases) {
         const aliases =
           typeof settings.modelAliases === "string"