## ADDED Requirements

### Requirement: Standardized API Response Format
The system SHALL return all API responses in a consistent standardized format.

#### Scenario: Successful API response
- **WHEN** API request succeeds
- **THEN** response includes success=true
- **THEN** response includes data field with result
- **THEN** response includes timestamp field

#### Scenario: Error API response
- **WHEN** API request fails
- **THEN** response includes success=false
- **THEN** response includes error_code field
- **THEN** response includes message field with description

### Requirement: API Versioning
The system SHALL support API versioning to enable backwards compatibility during upgrades.

#### Scenario: Versioned API endpoint
- **WHEN** client calls /api/v1/tasks
- **THEN** system routes to current version implementation
- **THEN** response works with v1 client expectations

#### Scenario: Legacy API route
- **WHEN** client calls /api/tasks (unversioned)
- **THEN** system routes to default version
- **THEN** response includes deprecation warning header

### Requirement: Comprehensive Health Check
The system SHALL provide detailed health check endpoints for monitoring.

#### Scenario: All systems healthy
- **WHEN** health check is called and all dependencies are available
- **THEN** response includes status=healthy
- **THEN** response includes checks object with database=ok, redis=ok

#### Scenario: Partial system failure
- **WHEN** health check is called and Redis is unavailable
- **THEN** response includes status=degraded
- **THEN** response includes checks object with database=ok, redis=error

### Requirement: Project Templates
The system SHALL support project templates to standardize project creation.

#### Scenario: Create project from template
- **WHEN** user creates project selecting a template
- **THEN** system copies TaskStatus definitions from template
- **THEN** system copies CustomField definitions from template
- **THEN** project is created with predefined structure

#### Scenario: Save project as template
- **WHEN** user saves existing project as template
- **THEN** system creates template with project's TaskStatus definitions
- **THEN** system creates template with project's CustomField definitions
- **THEN** template is available for future project creation