docs: update documentation to reflect unified config system

- Update config README to focus on current unified system rather than migration
- Update architecture migration doc to reference unifiedConfig instead of appConfig
- Update implementation summary to reference unified.config.ts
- Remove migration-specific content not relevant for new applications
- Provide clear guidance for working with unified configuration system

config/README.md

@@ -4,24 +4,23 @@ This directory contains the unified configuration system for the RxMinder applic
 
 ## Overview
 
-The unified configuration system replaces the previous scattered approach of multiple `.env` files and environment-specific configurations with a centralized, type-safe, and environment-aware system.
+The unified configuration system serves as the **single source of truth** for all application configuration. It reads from your `.env` file for environment-specific overrides and provides a centralized, type-safe, and environment-aware configuration system.
 
 ### Key Benefits
 
-- 🎯 **Single Source of Truth**: All configuration in one place
+- 🎯 **Single Source of Truth**: Unified config with `.env` file overrides
 - 🔒 **Type Safety**: Full TypeScript support with interfaces
-- 🌍 **Environment Aware**: Automatic environment-specific overrides
+- 🌍 **Environment Aware**: Reads from `.env` file for environment-specific settings
 - 🚀 **Auto-Generation**: Generates all necessary config files automatically
-- 🔄 **Easy Migration**: Smooth transition from old config system
-- 📝 **Self-Documenting**: Clear structure with validation
+- 🔄 **Simplified Architecture**: Clean, maintainable configuration management
+- 📝 **Self-Documenting**: Clear structure with validation and debugging tools
 
 ## File Structure
 
 ```
 config/
 ├── README.md                    # This documentation
-├── unified.config.ts           # Main unified configuration
-├── app.config.ts              # Legacy config (deprecated)
+├── unified.config.ts           # Single source of truth configuration
 └── generated/                 # Auto-generated configs
     ├── development.config.ts
     ├── staging.config.ts
@@ -49,20 +48,21 @@ if (featureFlags.enableOAuth) {
 }
 ```
 
-### 2. Environment Variables
+### 2. Environment Variables (.env file)
 
-The system reads from environment variables with fallbacks to sensible defaults:
+The system reads from your `.env` file as the primary source for environment-specific overrides:
 
 ```bash
-# Required variables
-APP_NAME=RxMinder
+# .env file - Primary configuration source
+APP_NAME=rxminder
 NODE_ENV=production
-VITE_COUCHDB_URL=http://couchdb:5984
+VITE_COUCHDB_URL=http://rxminder-couchdb-service:5984
+VITE_COUCHDB_USER=admin
+VITE_COUCHDB_PASSWORD=your-secure-password
 
-# Optional variables with defaults
-APP_VERSION=1.0.0
-DEBUG_MODE=false
-ENABLE_OAUTH=true
+# Container configuration
+CONTAINER_REGISTRY=your-registry.com
+CONTAINER_REPOSITORY=your-org/app
 ```
 
 ### 3. Generating Config Files
@@ -278,23 +278,29 @@ bun scripts/generate-unified-config.ts production
 bun scripts/generate-unified-config.ts --dry-run
 ```
 
-## Migration from Old System
+## Working with the Configuration System
 
-If you're migrating from the old configuration system:
+### 1. Basic Usage
 
-### 1. Backup Current Configuration
+Access configuration in your application:
 
-```bash
-bun scripts/generate-unified-config.ts production
+```typescript
+import { unifiedConfig } from './config/unified.config';
+
+const appName = unifiedConfig.app.name;
+const dbUrl = unifiedConfig.database.url;
 ```
 
-### 2. Run Migration
+### 2. Environment Overrides
+
+Add variables to your `.env` file:
 
 ```bash
-bun scripts/generate-unified-config.ts --all
+APP_NAME=my-app
+VITE_COUCHDB_URL=http://localhost:5984
 ```
 
-### 3. Generate New Config Files
+### 3. Generate Configs
 
 ```bash
 make generate-config
@@ -402,10 +408,21 @@ make deploy-prod-quick
 For questions or issues with the unified configuration system:
 
 1. Check this documentation first
-2. Run diagnostic commands (`make config-debug`, `make validate-config`)
+2. Run diagnostic commands:
+   - `make config-check` - Health check of entire config system
+   - `make config-debug` - Show current configuration values
 3. Review generated configuration files
-4. Check application logs for configuration-related errors
+4. Check `.env` file for environment-specific overrides
+5. Check application logs for configuration-related errors
+
+## Configuration Priority
+
+The unified config uses this priority order:
+
+1. **`.env` file** (highest priority) - Environment-specific overrides
+2. **Environment configs** (medium priority) - Built-in environment defaults
+3. **Default values** (lowest priority) - Fallback defaults in unified.config.ts
 
 ---
 
-_This unified configuration system provides a robust, scalable, and maintainable approach to application configuration management._
+_The unified configuration system provides a robust, scalable, and maintainable approach to application configuration management with `.env` file integration._