infra(docker): add Docker Compose with PostgreSQL and Keycloak

- Add docker-compose.yml (v3.9) with postgres:16-alpine and keycloak:26.1 services
- Configure PostgreSQL with separate workclub and keycloak databases
- Setup Keycloak with database backend, admin user, and realm import capability
- Create PostgreSQL init script to provision development databases and users
- Add placeholder realm-export.json for Keycloak realm configuration
- Configure healthchecks and app-network bridge for service discovery
- Document configuration and patterns in learnings.md

.sisyphus/evidence/task-1-setup-verification.txt

@@ -0,0 +1,86 @@
+=== TASK 1: Monorepo Scaffolding Verification ===
+Date: 2026-03-03
+Task: Initialize git repository, create monorepo directory structure, .NET 10 solution with 6 projects
+
+=== GIT INITIALIZATION ===
+✓ Git repository initialized at /Users/mastermito/Dev/opencode/.git/
+
+=== DIRECTORY STRUCTURE ===
+✓ backend/
+✓ frontend/
+✓ infra/
+
+=== CONFIGURATION FILES ===
+✓ .gitignore (with dotnet, node, IDE patterns)
+✓ .editorconfig (C# conventions)
+✓ backend/global.json (pinned to .NET 10.0.100)
+
+=== .NET SOLUTION ===
+Solution File: backend/WorkClub.slnx (new .NET 10 format)
+SDK Version: 10.0.100
+
+=== PROJECTS CREATED ===
+1. ✓ WorkClub.Api (ASP.NET Core Web API)
+2. ✓ WorkClub.Application (Class Library)
+3. ✓ WorkClub.Domain (Class Library)
+4. ✓ WorkClub.Infrastructure (Class Library)
+5. ✓ WorkClub.Tests.Unit (xUnit)
+6. ✓ WorkClub.Tests.Integration (xUnit)
+
+=== PROJECT REFERENCES (CLEAN ARCHITECTURE) ===
+✓ Api → Application + Infrastructure
+✓ Application → Domain
+✓ Infrastructure → Domain
+✓ Tests.Unit → Api, Application, Domain, Infrastructure
+✓ Tests.Integration → Api, Application, Domain, Infrastructure
+
+=== NUGET PACKAGES ADDED ===
+Application:
+  ✓ Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0
+  ✓ Finbuckle.MultiTenant 8.2.0 (resolved to 9.0.0)
+
+Infrastructure:
+  ✓ Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0
+
+Api:
+  ✓ Microsoft.AspNetCore.Authentication.JwtBearer 10.0.0
+
+Tests.Integration:
+  ✓ Testcontainers.PostgreSql 3.7.0
+  ✓ Microsoft.AspNetCore.Mvc.Testing 10.0.0
+
+=== GIT COMMIT ===
+✓ Commit created: c7dd329
+✓ Message: "chore(scaffold): initialize git repo and monorepo with .NET solution"
+✓ Files committed: 26 files, 3063 insertions
+
+=== BUILD VERIFICATION ===
+Command: dotnet build backend/WorkClub.slnx --configuration Release
+
+Output Summary:
+  ✓ 6 projects built successfully
+  ✓ Ellapsed: 4.64 seconds
+  ✓ Errors: 0
+  ✓ Warnings: 14 (expected - NuGet version mismatches, Testcontainers security advisories)
+
+Build Results:
+  WorkClub.Domain → /Users/mastermito/Dev/opencode/backend/WorkClub.Domain/bin/Release/net10.0/WorkClub.Domain.dll
+  WorkClub.Infrastructure → /Users/mastermito/Dev/opencode/backend/WorkClub.Infrastructure/bin/Release/net10.0/WorkClub.Infrastructure.dll
+  WorkClub.Application → /Users/mastermito/Dev/opencode/backend/WorkClub.Application/bin/Release/net10.0/WorkClub.Application.dll
+  WorkClub.Api → /Users/mastermito/Dev/opencode/backend/WorkClub.Api/bin/Release/net10.0/WorkClub.Api.dll
+  WorkClub.Tests.Unit → /Users/mastermito/Dev/opencode/backend/WorkClub.Tests.Unit/bin/Release/net10.0/WorkClub.Tests.Unit.dll
+  WorkClub.Tests.Integration → /Users/mastermito/Dev/opencode/backend/WorkClub.Tests.Integration/bin/Release/net10.0/WorkClub.Tests.Integration.dll
+
+=== COMPLETION CHECKLIST ===
+[x] Git repository initialized at /Users/mastermito/Dev/opencode
+[x] Initial commit created with "chore(scaffold): initialize git repo and monorepo with .NET solution"
+[x] Directory structure: backend/, frontend/, infra/
+[x] .NET solution at backend/WorkClub.slnx with 6 projects
+[x] Project references follow Clean Architecture pattern
+[x] Files: .gitignore (comprehensive), .editorconfig, global.json
+[x] NuGet packages added to appropriate projects
+[x] Verification: dotnet build backend/WorkClub.slnx → exit 0, 6 succeeded, 0 failed
+[x] Evidence saved to .sisyphus/evidence/task-1-setup-verification.txt
+
+=== STATUS ===
+✓ TASK COMPLETE: All requirements met, solution compiles with zero errors.