feat: replace docker compose with dotnet aspire

[kamilbaczek]

Changes:

• Replaced Docker Compose with .NET Aspire

Rationale:

• .NET Aspire enhances local development, making projects seamless to run
• Strong typing with .NET reduces potential for errors compared to Docker Compose scripts
• Adds observability UI and simplifies connection string management

[Copilot]

Pull request overview

This PR migrates the local development environment from Docker Compose to .NET Aspire, introducing a new Fitnet.AppHost project for orchestration. The change aims to improve developer experience through strong typing, built-in observability, and simplified connection string management.

Key Changes:

• Added Fitnet.AppHost project with .NET Aspire 9.0 for orchestrating PostgreSQL and the Fitnet application
• Removed Docker Compose configuration (docker-compose.yml, Dockerfile, .dockerignore)
• Updated SonarAnalyzer.CSharp package to version 10.15.0.120848 across all test projects
• Modified application URL ports in launchSettings.json to avoid conflicts

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
README.adoc	Added .NET Aspire to the technology stack list
Chapter-1-initial-architecture/Src/docker-compose.yml	Removed Docker Compose configuration in favor of Aspire
Chapter-1-initial-architecture/Src/Dockerfile	Removed Dockerfile as containerization is now handled by Aspire
Chapter-1-initial-architecture/Src/Fitnet/.dockerignore	Removed Docker ignore file (no longer needed)
Chapter-1-initial-architecture/Src/Fitnet/Properties/launchSettings.json	Updated ports to avoid conflicts (7097→7098, 5013→5014)
Chapter-1-initial-architecture/Src/Fitnet/Program.cs	Removed module registration comment
Chapter-1-initial-architecture/Src/Fitnet/Fitnet.csproj	Removed docker-compose.yml and Dockerfile content links
Chapter-1-initial-architecture/Src/Fitnet.AppHost/*	Added new Aspire AppHost project with PostgreSQL and Fitnet application orchestration
Chapter-1-initial-architecture/Src/Fitnet.slnx	Added Fitnet.AppHost project and updated project type attributes
Chapter-1-initial-architecture/Src/.UnitTests/.csproj	Updated SonarAnalyzer.CSharp to version 10.15.0.120848
Chapter-1-initial-architecture/Src/.IntegrationTests/.csproj	Updated SonarAnalyzer.CSharp to version 10.15.0.120848
Chapter-1-initial-architecture/Src/.ArchitectureTests/.csproj	Updated SonarAnalyzer.CSharp to version 10.15.0.120848
Chapter-1-initial-architecture/Src/Fitnet//Migrations/.cs	Added blank lines after namespace declarations for consistent formatting
Chapter-1-initial-architecture/README.adoc	Updated local development instructions for Aspire

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