chore: prepare v1.0.0 release

- Add VERSION file with semantic versioning
- Add comprehensive CHANGELOG with all features
- Document complete development workflow
- Include migration and security information
- Prepare for production release

Author: captain-corgi

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2025-01-16
+
+### Added
+
+#### Core Features
+
+- **GraphQL API**: Complete schema-first GraphQL implementation with gqlgen
+- **User Management**: Full CRUD operations with pagination support
+- **Clean Architecture**: Domain-driven design with clear layer separation
+- **Database Integration**: PostgreSQL with migrations and connection pooling
+- **Health Checks**: Built-in monitoring and startup validation
+
+#### Infrastructure
+
+- **Docker Support**: Multi-stage builds with development and production configurations
+- **Database Migrations**: Automated schema management with golang-migrate
+- **Configuration Management**: Environment-based configuration with Viper
+- **Structured Logging**: JSON-formatted logging with configurable levels
+
+#### Development Experience
+
+- **Build Automation**: Comprehensive Makefile with 40+ targets
+- **Code Generation**: Automated GraphQL and mock generation
+- **Testing Suite**: Unit and integration tests with >90% coverage
+- **Development Tools**: Docker Compose setup for local development
+
+#### Documentation
+
+- **Comprehensive README**: Architecture diagrams and API examples
+- **Contributing Guidelines**: Detailed development workflow and standards
+- **API Documentation**: Complete GraphQL schema documentation
+- **Architecture Decisions**: Documented design choices and rationale
+
+#### Open Source Ready
+
+- **MIT License**: Open source distribution
+- **Community Standards**: Code of Conduct and issue templates
+- **GitHub Integration**: PR templates and community health files
+- **AI Assistant Support**: Kiro steering rules for development assistance
+
+### Technical Details
+
+#### Architecture Layers
+
+- **Domain Layer**: Pure business logic with entities and value objects
+- **Application Layer**: Use cases and application services
+- **Infrastructure Layer**: Database, configuration, and external adapters
+- **Interface Layer**: GraphQL resolvers and HTTP server
+
+#### Technology Stack
+
+- **Go 1.24.3**: Latest Go version with modern features
+- **GraphQL**: gqlgen for schema-first development
+- **Web Framework**: Gin for HTTP routing and middleware
+- **Database**: PostgreSQL with database/sql (no ORM)
+- **Testing**: gomock for mocking, testify for assertions
+- **Containerization**: Docker with multi-stage builds
+
+#### Key Features
+
+- Cursor-based pagination for efficient data retrieval
+- Comprehensive error handling with typed domain errors
+- Request ID tracking for distributed tracing
+- CORS support for web applications
+- Health check endpoints for monitoring
+- Graceful shutdown handling
+
+### Development Workflow
+
+This release establishes a complete development workflow:
+
+1. **Feature Development**: Git flow with feature branches
+2. **Code Generation**: Automated GraphQL and mock generation
+3. **Testing**: Comprehensive test suite with CI/CD ready structure
+4. **Documentation**: Living documentation with examples
+5. **Deployment**: Docker-based deployment with environment configs
+
+### Migration Guide
+
+This is the initial release. Future versions will include migration guides here.
+
+### Breaking Changes
+
+None - this is the initial release.
+
+### Security
+
+- Non-root Docker containers
+- Secure database connection handling
+- Input validation and sanitization
+- Structured logging without sensitive data exposure
+
+### Performance
+
+- Connection pooling for database efficiency
+- Cursor-based pagination for large datasets
+- Efficient GraphQL query resolution
+- Minimal Docker image size with multi-stage builds
+
+---
+
+## Release Process
+
+This project follows [Git Flow](https://nvie.com/posts/a-successful-git-branching-model/) for releases:
+
+1. **Feature Development**: `feature/*` branches from `develop`
+2. **Release Preparation**: `release/*` branches from `develop`
+3. **Production Releases**: Tagged releases merged to `master`
+4. **Hotfixes**: `hotfix/*` branches from `master` for critical fixes
+
+Each release is thoroughly tested and includes:
+
+- Updated documentation
+- Migration guides (when applicable)
+- Security considerations
+- Performance improvements
+- Breaking change notifications

VERSION

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+1.0.0