Design environment-specific naming convention system

**Summary**: Create a flexible naming convention system that automatically generates resource names based on environment type, organization standards, and project context.

**Acceptance Criteria**:
- [ ] Configurable naming convention templates per environment type
- [ ] Support for organization-wide naming standards and policies
- [ ] Automatic resource name generation with environment type integration
- [ ] Name uniqueness validation across environments and regions
- [ ] Custom naming pattern support for specific resource types
- [ ] Integration with existing azd resource naming and generation