- Add static OpenAPI 3.0.3 spec (services/backend-api/static/openapi.yaml)
covering all ~70 endpoints with schemas, security, tags and responses
- Serve Swagger UI at GET /docs (embedded HTML, dark OmniOil theme)
- Serve raw YAML at GET /docs/openapi.yaml (include_str! at compile time)
- Add Tower middleware (api_version.rs) injecting X-API-Version: 1 and
X-Powered-By: OmniOil/1.0 on every response
- Replace static /health handler with enhanced health_check that probes
DB latency, tracks uptime via OnceLock, returns structured HealthResponse
- Expand API Explorer frontend: 70+ endpoints in 10 groups, PATCH color
coding (purple), group filter pills, count badge, Swagger UI links
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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