feat: implement unified configuration as single source of truth

- Make unified config lazy-loaded to avoid initialization issues
- Replace direct config exports with getter functions
- Rewrite utils/env.ts to use unified config instead of scattered access
- Add show-config.js helper script for configuration management
- Type-safe configuration access throughout the app
- Smart defaults for all environments with environment overrides
- Eliminates scattered process.env and import.meta.env access

config/unified.config.ts

@@ -809,24 +809,33 @@ export function createUnifiedConfigForEnvironment(
 }
 
 /**
- * Singleton configuration instance
+ * Lazy-loaded singleton configuration instance
  */
-export const unifiedConfig = createUnifiedConfig();
+let _unifiedConfig: UnifiedConfig | null = null;
+
+export const unifiedConfig: UnifiedConfig = new Proxy({} as UnifiedConfig, {
+  get(target, prop) {
+    if (!_unifiedConfig) {
+      _unifiedConfig = createUnifiedConfig();
+    }
+    return _unifiedConfig[prop as keyof UnifiedConfig];
+  },
+});
 
 /**
  * Export specific configuration sections for convenience
  */
-export const appConfig = unifiedConfig.app;
-export const databaseConfig = unifiedConfig.database;
-export const containerConfig = unifiedConfig.container;
-export const kubernetesConfig = unifiedConfig.kubernetes;
-export const authConfig = unifiedConfig.auth;
-export const emailConfig = unifiedConfig.email;
-export const oauthConfig = unifiedConfig.oauth;
-export const featureFlags = unifiedConfig.features;
-export const performanceConfig = unifiedConfig.performance;
-export const loggingConfig = unifiedConfig.logging;
-export const securityConfig = unifiedConfig.security;
+export const getAppConfig = () => unifiedConfig.app;
+export const getDatabaseConfig = () => unifiedConfig.database;
+export const getContainerConfig = () => unifiedConfig.container;
+export const getKubernetesConfig = () => unifiedConfig.kubernetes;
+export const getAuthConfig = () => unifiedConfig.auth;
+export const getEmailConfig = () => unifiedConfig.email;
+export const getOAuthConfig = () => unifiedConfig.oauth;
+export const getFeatureFlags = () => unifiedConfig.features;
+export const getPerformanceConfig = () => unifiedConfig.performance;
+export const getLoggingConfig = () => unifiedConfig.logging;
+export const getSecurityConfig = () => unifiedConfig.security;
 
 /**
  * Utility functions