fix: sandbox warning persistence and add env var option

Fix race condition where sandbox warning appeared on every refresh
even after checking "Do not show again". The issue was that the
sandbox check effect ran before settings were hydrated from the
server, so skipSandboxWarning was always false (the default).

Changes:
- Add settingsLoaded to sandbox check dependencies to ensure the
  user's preference is loaded before checking
- Add AUTOMAKER_SKIP_SANDBOX_WARNING env var option to skip the
  warning entirely (useful for dev/CI environments)

apps/server/src/routes/health/routes/environment.ts

@@ -9,12 +9,14 @@ import type { Request, Response } from 'express';
 
 export interface EnvironmentResponse {
   isContainerized: boolean;
+  skipSandboxWarning?: boolean;
 }
 
 export function createEnvironmentHandler() {
   return (_req: Request, res: Response): void => {
     res.json({
       isContainerized: process.env.IS_CONTAINERIZED === 'true',
+      skipSandboxWarning: process.env.AUTOMAKER_SKIP_SANDBOX_WARNING === 'true',
     } satisfies EnvironmentResponse);
   };
 }