feat(dclint): add native Rust Docker Compose linter

This commit introduces dclint, a Rust implementation of Docker Compose
linting inspired by docker-compose-linter (https://github.com/zavoloklom/docker-compose-linter)
by Sergey Suspended, rebuilt natively for Rust integration.

## DCLint (src/analyzer/dclint/)

Native Docker Compose linting without external dependencies:
- Complete Docker Compose YAML parser
- 15 lint rules (DCL001-DCL015 series)
- Pragma support for inline rule configuration
- Configurable severity thresholds

### Rules Implemented
- DCL001-DCL015: Service configuration validation
- Build context, image naming, port mapping checks
- Environment variable and volume mount validation
- Network and dependency configuration linting

### Formatters (src/analyzer/dclint/formatter/)
- JSON: Machine-readable for CI/CD pipelines
- Stylish: Colored terminal output
- GitHub: GitHub Actions annotations format

## Agent Integration (src/agent/tools/dclint.rs)

AI-optimized tool for compose file validation with structured
output for agent consumption.

## Attribution

This implementation is inspired by docker-compose-linter
(https://github.com/zavoloklom/docker-compose-linter) by Sergey Suspended.
The original project is licensed under MIT.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: 2 people