Add OpenAPI contract and generated frontend client

README.md

@@ -18,6 +18,7 @@ Pick'n'Play is a .NET 10 ASP.NET Core Minimal API app with a static HTML/CSS/JS
 ## Frontend Tooling
 
 - Install tooling: `npm install`
+- Generate API client from OpenAPI: `npm run generate:api-client` (expects `openapi/GameList.json` generated by `dotnet build`)
 - Lint JS: `npm run lint`
 - Check formatting: `npm run format:check`
 - Apply formatting: `npm run format`
@@ -59,6 +60,7 @@ Pick'n'Play is a .NET 10 ASP.NET Core Minimal API app with a static HTML/CSS/JS
 ## Operations
 
 - API surface and endpoint contract: `API.md`
+- Generated OpenAPI document: `openapi/GameList.json` (runtime: `/openapi/v1.json`)
 - Product/feature expectations: `SPEC.md`
 - IIS deployment notes: `IIS.md`
 - Test strategy details: `TESTS.md`
@@ -68,7 +70,8 @@ Pick'n'Play is a .NET 10 ASP.NET Core Minimal API app with a static HTML/CSS/JS
 GitHub Actions workflow: `.github/workflows/ci.yml`
 
 - Restores dependencies
-- Runs frontend lint and format checks
 - Builds with warnings treated as errors
+- Generates frontend API client from OpenAPI contract
+- Runs frontend lint and format checks
 - Runs `GameList.Tests` with coverage collection
 - Enforces minimum coverage thresholds (line 90%, branch 70%)