Code fixed

.claude/CLAUDE.md

@@ -24,18 +24,45 @@ frontend/                          -- React SPA (Vite dev server :5173)
 docs/                              -- Architecture, API, DB schema docs (Chinese)
 ```
 
+## Compiler Constraints
+
+`Directory.Build.props` enforces globally -- all code must satisfy:
+- `TreatWarningsAsErrors` enabled -- zero warnings allowed
+- `Nullable` enabled -- all reference types are non-nullable by default, use `?` for nullable
+- `StyleCop.Analyzers` -- code style enforced at build time
+- `EnforceCodeStyleInBuild` enabled
+
+## Layer Dependencies (strict)
+
+```
+Core          -- zero external NuGet deps, no project references
+Application   -- references Core only. MediatR, AutoMapper, FluentValidation
+Infrastructure-- references Application. EF Core, Npgsql, Polly, Azure Storage, Identity
+Integrations  -- references Core only. HttpClient-based provider implementations
+Api           -- references Application, Infrastructure, Integrations. Serilog, Swashbuckle
+UnitTests     -- references Application, Core. xUnit, Moq, FluentAssertions
+IntegrationTests -- references Api. WebApplicationFactory, Testcontainers.PostgreSql
+```
+
 ## Commands
 
 ```bash
-# Backend
-cd backend && dotnet restore && dotnet build
+# Infrastructure
+docker-compose up -d   # PostgreSQL + Redis
+
+# Backend (from backend/)
+dotnet restore && dotnet build
 dotnet run --project src/FiscalFlow.Api
 dotnet test
 dotnet test tests/FiscalFlow.UnitTests
+dotnet test --collect:"XPlat Code Coverage"   # with coverage
 
-# Frontend
-cd frontend && npm install
-npm run dev
+# EF Core migrations (from backend/)
+dotnet ef migrations add <Name> --project src/FiscalFlow.Infrastructure --startup-project src/FiscalFlow.Api
+dotnet ef database update --project src/FiscalFlow.Infrastructure --startup-project src/FiscalFlow.Api
+
+# Frontend (from frontend/)
+npm install && npm run dev
 npm run build
 npm run lint
 ```