Edit Issue - .issue.db

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Description

## Scope
Document utility and system endpoints:
- `api/blueprints/v1/health.py` (2 endpoints)
- `api/blueprints/v1/statistics.py` (2 endpoints)
- `api/blueprints/v1/idempotency.py` (2 endpoints)
- `api/blueprints/v1/dsl_templates.py` (2 endpoints)
- `api/blueprints/v1/dsl_converter.py` (1 endpoint)
- `api/blueprints/v1/version.py` (1 endpoint)
- `api/blueprints/v1/tenants.py` (1 endpoint)
- `api/blueprints/v1/queries.py` (1 endpoint)
- `api/blueprints/v1/monitoring.py` (1 endpoint)

## Health Endpoints (2)
1. GET /health - Health check
2. GET /health/detailed - Detailed health check

## Statistics Endpoints (2)
1. GET /statistics - System statistics
2. GET /statistics/detailed - Detailed stats

## Idempotency Endpoints (2)
1. GET /idempotency/{key} - Check idempotency key
2. DELETE /idempotency/{key} - Clear idempotency key

## DSL Templates Endpoints (2)
1. GET /dsl-templates - List templates
2. GET /dsl-templates/{name} - Get template

## DSL Converter Endpoint (1)
1. POST /dsl/convert - Convert Python DSL to JSON

## Version Endpoint (1)
1. GET /version - Get API version

## Tenants Endpoint (1)
1. GET /tenants/current - Get current tenant info

## Queries Endpoint (1)
1. GET /workflows/{id}/query - Query workflow state

## Monitoring Endpoint (1)
1. GET /metrics - Prometheus metrics

## Pydantic Models
```python
class HealthResponse(BaseModel):
    status: str  # healthy, degraded, unhealthy
    version: str
    uptime_seconds: int

class DetailedHealthResponse(HealthResponse):
    database: str
    redis: str
    workers: int
    queue_depth: int

class SystemStatistics(BaseModel):
    total_workflows: int
    running_workflows: int
    completed_today: int
    failed_today: int
    avg_duration_ms: float

class VersionInfo(BaseModel):
    version: str
    build_date: str
    git_commit: str
```

## Depends On
- #224 (Infrastructure Setup)

## Acceptance Criteria
- [ ] All 13 endpoints documented
- [ ] Health check response codes documented
- [ ] Prometheus format documented

Due Date (YYYY-MM-DD)

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Edit Issue #232