docs: add comprehensive API endpoint inventory and update implementation status

[NormB]

Summary

Created comprehensive API endpoint inventory documentation and updated API patterns documentation with implementation status. This provides complete reference documentation for all 22 API endpoints across 5+ language implementations.

Changes Made

1. New File: API_ENDPOINT_INVENTORY.md

Comprehensive API endpoint catalog with:

• Complete endpoint documentation: All 22 endpoints with request/response details
• Implementation matrix: Coverage across Python, Go, Node.js, Rust, TypeScript
• Endpoint categories:
  • Health Checks (8 endpoints)
  • Vault Integration (2 endpoints)
  • Database Operations (3 endpoints)
  • Cache Operations (3 endpoints)
  • Messaging Operations (2 endpoints)
  • Redis Cluster Management (4 endpoints)
• Response schemas: TypeScript-style type definitions for all models
• Error handling: Standard HTTP status codes and error formats
• Rate limiting & caching: Strategy documentation (FastAPI implementations)
• Testing coverage: 38 test functions, ~64 test runs with parameterization
• Security considerations: Production recommendations and warnings
• Quick reference: Start commands and testing guides

2. Updated: API_PATTERNS.md

Added completion status header:

• ✅ COMPLETE & PRODUCTION-READY status indicator
• Updated last modified date to 2025-11-21
• Added metrics:
  • 22 endpoints across 5+ implementations
  • 26/26 parity tests passing
  • 38 test functions in shared test suite

Documentation Highlights

Endpoint Documentation

Each endpoint includes:

• HTTP method and path
• Description and purpose
• Request parameters (path, query, body)
• Response models with TypeScript definitions
• Implementation notes (async patterns, error handling)
• Example requests and responses
• Rate limiting and caching details

Implementation Matrix

Language	Port	Status	Endpoints	Tests	Notes
Python (Code-First)	8000	✅ Complete	22/22	188 unit tests	Flagship
Python (API-First)	8001	✅ Complete	22/22	26/26 parity	100% parity
Go (Gin)	8002	✅ Complete	22/22	13 tests	Production-grade
Node.js (Express)	8003	✅ Complete	22/22	Integration tests	Modern async
Rust (Actix-web)	8004	✅ Complete	22/22	44 comprehensive	Zero unwrap()
TypeScript (Express)	8005	🚧 In Dev	-	-	API-first

Response Model Examples

// HealthStatus
{
  status: "healthy" | "degraded" | "unhealthy",
  services: {
    [serviceName: string]: ServiceHealth
  }
}

// CacheGetResponse
{
  key: string,
  value: string | null,
  exists: boolean,
  ttl: number | string | null
}

Verification

• ✅ All 22 endpoints documented against OpenAPI 3.1.0 spec
• ✅ Verified implementation coverage across all languages
• ✅ Request/response models match actual implementations
• ✅ Security considerations documented
• ✅ Testing strategy comprehensive
• ✅ Quick reference guide for developers

Benefits

For Developers

• Complete API reference in one place
• Cross-language implementation comparison
• Example requests/responses for all endpoints
• Clear documentation of rate limits, caching, errors

For API Consumers

• Comprehensive endpoint catalog
• Response schema documentation
• Error handling patterns
• Security considerations

For Contributors

• Implementation status matrix
• Testing coverage details
• Synchronization validation status
• Development patterns documented

Documentation Files Updated

1. NEW: reference-apps/API_ENDPOINT_INVENTORY.md (686 lines)

   • Complete API endpoint catalog
   • Implementation verification
   • Response models and examples

2. UPDATED: reference-apps/API_PATTERNS.md

   • Added completion status header
   • Updated metrics and statistics
   • Current date and status

Quick Links

• API Endpoint Inventory
• API Patterns Guide
• Shared OpenAPI Spec
• Shared Test Suite

Testing

All endpoints verified against:

• ✅ OpenAPI 3.1.0 specification
• ✅ Actual implementation routes
• ✅ Response model schemas
• ✅ Shared test suite (38 functions, ~64 runs)
• ✅ Parity validation (26/26 tests passing)

No code changes - documentation only.