Add dark mode and theme switching functionality to the application.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 705f2157-ef97-4fbd-89e4-8c7f2ecaea90
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7ed01c5f-a82d-405a-b728-b2e3d127c60c/69154111-0a6b-4eae-ac42-425c5260b653.jpg

.env.example

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+# Database Configuration
+POSTGRES_USER=admanagement
+POSTGRES_PASSWORD=strong_password_here
+POSTGRES_DB=admanagement
+DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}
+
+# Redis Configuration
+REDIS_URL=redis://redis:6379
+
+# Application Configuration
+NODE_ENV=production
+PORT=5000
+SESSION_SECRET=change_this_to_a_random_string
+DEBUG=api:*
+
+# JWT Secret for API tokens
+JWT_SECRET=change_this_to_a_different_random_string
+JWT_EXPIRY=24h
+
+# LDAP Connection Default Settings
+LDAP_CONNECT_TIMEOUT=10000
+LDAP_IDLE_TIMEOUT=60000
+LDAP_RECONNECT_TIMEOUT=10000
+
+# Rate Limiting
+RATE_LIMIT_WINDOW_MS=900000
+RATE_LIMIT_MAX_REQUESTS=1000
+
+# Logging
+LOG_LEVEL=info