Fix Settings Diamond Dependency and Top-Level Await Side-Effects between cached.ts and settings/index.ts #43048

📌 Description

A architectural anti-pattern and Diamond Dependency exists between apps/meteor/server/settings/cached.ts and apps/meteor/server/settings/index.ts.

Currently, consumer modules requiring read-only access to settings (e.g., settings.get()) import settings inconsistently across two competing paths:

1. apps/meteor/server/settings/cached.ts (lightweight, pure in-memory cache).
2. apps/meteor/server/settings/index.ts (barrel file re-exporting settings, but also invoking await initializeSettings() hitting MongoDB via top-level await).

This creates an accidental diamond dependency, delays module evaluation due to top-level await database queries, breaks unit testing in isolated environments, and introduces circular dependency hazards.

🔍 Root Cause Analysis

1. Top-Level Await at Module Evaluation Time:
   apps/meteor/server/settings/index.ts executes:

   await initializeSettings({ model: Settings, settings });