test: add comprehensive tests for all Epic 1 stories

Story 1.2: Database Layer
- Test database client creation, connection, ping, and close
- Test connection pooling configuration
- Tests skip if database is not available (short mode)

Story 1.3: Health Monitoring and Metrics
- Test health registry registration and checking
- Test database health checker
- Test liveness and readiness checks
- Test metrics creation, middleware, and handler
- Test Prometheus metrics endpoint

Story 1.4: Error Handling and Error Bus
- Test channel-based error bus creation
- Test error publishing with context
- Test nil error handling
- Test channel full scenario
- Test graceful shutdown
- Fix Close() method to handle multiple calls safely

Story 1.5: HTTP Server and Middleware
- Test server creation with all middleware
- Test request ID middleware
- Test logging middleware
- Test panic recovery middleware
- Test CORS middleware
- Test timeout middleware
- Test health and metrics endpoints
- Test server shutdown

Story 1.6: OpenTelemetry Tracing
- Test tracer initialization (enabled/disabled)
- Test development and production modes
- Test OTLP exporter configuration
- Test graceful shutdown
- Test no-op tracer provider

All tests follow Go testing best practices:
- Table-driven tests where appropriate
- Parallel execution
- Proper mocking of interfaces
- Skip tests requiring external dependencies in short mode

README.md

@@ -4,7 +4,7 @@
 
 A modular, extensible platform built with Go that provides a solid foundation for building scalable, secure, and observable applications. The platform supports plugin-based architecture, enabling teams to build feature modules independently while sharing core services.
 
-## 🏗️ Architecture Overview
+## Architecture Overview
 
 Go Platform follows **Clean/Hexagonal Architecture** principles with clear separation between:
 
@@ -23,7 +23,7 @@ Go Platform follows **Clean/Hexagonal Architecture** principles with clear separ
 - **Security-by-Design**: JWT authentication, RBAC/ABAC, and audit logging
 - **Observability**: OpenTelemetry, structured logging, and Prometheus metrics
 
-## 📁 Directory Structure
+## Directory Structure
 
 ```
 goplt/
@@ -59,7 +59,7 @@ goplt/
         └── ci.yml
 ```
 
-## 🚀 Quick Start
+## Quick Start
 
 ### Prerequisites
 
@@ -107,7 +107,7 @@ export DATABASE_DSN="postgres://user:pass@localhost/dbname"
 export LOGGING_LEVEL=debug
 ```
 
-## 🛠️ Development
+## Development
 
 ### Make Commands
 
@@ -150,7 +150,7 @@ Run all checks:
 make verify
 ```
 
-## 📚 Documentation
+## Documentation
 
 Comprehensive documentation is available in the `docs/` directory:
 
@@ -172,7 +172,7 @@ make docs-docker
 
 Documentation will be available at `http://127.0.0.1:8000`
 
-## 🏛️ Architecture
+## Architecture
 
 ### Core Kernel
 
@@ -223,7 +223,7 @@ Key configuration sections:
 - **Logging**: Log level, format, and output destination
 - **Authentication**: JWT settings and token configuration
 
-## 🧪 Testing
+## Testing
 
 The project follows table-driven testing patterns and includes:
 
@@ -232,7 +232,7 @@ The project follows table-driven testing patterns and includes:
 - Mock generation for interfaces
 - Test coverage reporting
 
-## 🤝 Contributing
+## Contributing
 
 1. Create a feature branch: `git checkout -b feature/my-feature`
 2. Make your changes following the project's architecture principles
@@ -240,11 +240,11 @@ The project follows table-driven testing patterns and includes:
 4. Commit your changes with clear messages
 5. Push to your branch and create a pull request
 
-## 📄 License
+## License
 
 [Add license information here]
 
-## 🔗 Links
+## Links
 
 - [Architecture Documentation](docs/content/architecture/)
 - [ADRs](docs/content/adr/)
@@ -254,7 +254,3 @@ The project follows table-driven testing patterns and includes:
 ## 📞 Support
 
 For questions and support, please refer to the documentation or create an issue in the repository.
-
----
-
-**Built with ❤️ using Go**