docs(backend): update infrastructure-setup feature with completed phases 1 and 2

- Mark acceptance criteria as complete
- Update Implementation Plan Phase 1 and 2 tasks
- Update Milestones for Backend Project and Database
- Update all Backend and Database tasks as complete
- Add progress history entries

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

docs/features/infrastructure-setup.md

@@ -20,11 +20,11 @@ Establish the foundational infrastructure for the DeutschLernen application, inc
 As a developer, I want to have a working backend and database setup so that I can begin implementing application features.
 
 ### Acceptance Criteria
-- [ ] .NET 9.0 backend project is created and builds successfully
-- [ ] PostgreSQL database is configured and accessible
+- [x] .NET 9.0 backend project is created and builds successfully
+- [x] PostgreSQL database is configured and accessible
 - [ ] Docker setup is ready for deployment
 - [ ] CI/CD pipeline is configured
-- [ ] Development environment is reproducible
+- [x] Development environment is reproducible
 
 ---
 
@@ -85,20 +85,20 @@ As a developer, I want to have a working backend and database setup so that I ca
 ## 🚀 Implementation Plan
 
 ### Phase 1: Backend Project Setup (2-4 hours)
-- [ ] Create GermanApp .NET 9.0 Web API project
-- [ ] Configure appsettings.json with multiple environments
-- [ ] Set up Health Checks endpoint
-- [ ] Configure CORS for frontend
-- [ ] Set up OpenAPI/Swagger documentation
-- [ ] Configure logging (Serilog or built-in)
-- [ ] Create base response models and error handling middleware
+- [x] Create GermanApp .NET 9.0 Web API project
+- [x] Configure appsettings.json with multiple environments
+- [x] Set up Health Checks endpoint
+- [x] Configure CORS for frontend
+- [x] Set up OpenAPI/Swagger documentation
+- [x] Configure logging (Serilog or built-in)
+- [x] Create base response models and error handling middleware
 
 ### Phase 2: Database Setup (1-2 hours)
-- [ ] Design and create initial database schema
-- [ ] Configure Entity Framework Core with PostgreSQL
-- [ ] Set up database migrations
-- [ ] Create seed data scripts
-- [ ] Configure connection strings for different environments
+- [x] Design and create initial database schema
+- [x] Configure Entity Framework Core with PostgreSQL
+- [x] Set up database migrations
+- [x] Create seed data scripts
+- [x] Configure connection strings for different environments
 
 ### Phase 3: Docker Configuration (2-4 hours)
 - [ ] Create Dockerfile for backend
@@ -118,8 +118,8 @@ As a developer, I want to have a working backend and database setup so that I ca
 ### Milestones
 | Milestone | Date | Status |
 |-----------|------|--------|
-| Backend Project Created | - | ⏳ |
-| Database Configured | - | ⏳ |
+| Backend Project Created | 2025-05-31 | ✅ |
+| Database Configured | 2025-05-31 | ✅ |
 | Docker Setup Complete | - | ⏳ |
 | CI/CD Pipeline Working | - | ⏳ |
 
@@ -128,23 +128,23 @@ As a developer, I want to have a working backend and database setup so that I ca
 ## ✅ Tasks
 
 ### Backend
-- [ ] Initialize .NET 9.0 Web API project
-- [ ] Configure Program.cs with proper middleware
-- [ ] Set up appsettings.Development.json, appsettings.Staging.json, appsettings.Production.json
-- [ ] Create HealthChecks endpoint
-- [ ] Configure Swagger/OpenAPI
-- [ ] Set up CORS policy
-- [ ] Configure logging
-- [ ] Create error handling middleware
-- [ ] Create base response wrappers
+- [x] Initialize .NET 9.0 Web API project
+- [x] Configure Program.cs with proper middleware
+- [x] Set up appsettings.Development.json, appsettings.Staging.json, appsettings.Production.json
+- [x] Create HealthChecks endpoint
+- [x] Configure Swagger/OpenAPI
+- [x] Set up CORS policy
+- [x] Configure logging
+- [x] Create error handling middleware
+- [x] Create base response wrappers
 
 ### Database
-- [ ] Install PostgreSQL locally for development
-- [ ] Create initial database schema
-- [ ] Configure EF Core DbContext
-- [ ] Create first migration
-- [ ] Apply migration to database
-- [ ] Create seed data for initial testing
+- [x] Install PostgreSQL locally for development
+- [x] Create initial database schema
+- [x] Configure EF Core DbContext
+- [x] Create first migration
+- [x] Apply migration to database
+- [x] Create seed data for initial testing
 
 ### Docker
 - [ ] Create backend Dockerfile
@@ -258,6 +258,9 @@ As a developer, I want to have a working backend and database setup so that I ca
 | Date | Status Change | Notes |
 |------|---------------|-------|
 | May 31, 2025 | Created | Initial plan based on application-plan.md |
+| May 31, 2025 | Status: Planned → In Progress | Started feature implementation |
+| May 31, 2025 | Phase 1 Complete | Backend project setup with Health Checks, CORS, Serilog, middleware |
+| May 31, 2025 | Phase 2 Complete | PostgreSQL configured, migrations created, seed data implemented |
 
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