Environment-Specific Configuration

[michaelbeale-IL]

Support development/production/test configuration files with layering.

Acceptance Criteria:

• Environment detection (dev/prod/test)
• Base + override config file loading
• Environment variable override support
• Documentation for environment setup
• Tests for all environments

Configuration Hierarchy:

1. Base configuration (config.json)
2. Environment configuration (config.dev.json)
3. Local overrides (config.local.json - gitignored)
4. Environment variables (ACAT_* prefix)

Files to Create:

• Libraries/ACATCore/Utility/EnvironmentConfiguration.cs
• Environment detection logic
• Config file resolution logic

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Epic: Configuration System Enhancement

Estimated Effort: 2 days

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Parent Feature: #191 - Configuration System Enhancement