Introduces automatic creation of a self-documenting startup.json file on first startup, with example path configurations for Linux, Windows, and portable setups. Adds preset database configurations to database.xml for easy switching between SQLite and PostgreSQL. Refactors database config classes for XML serialization compatibility and ensures database.xml is never empty. Comprehensive documentation and migration guides included.
- Added Jellyfin.Database.Providers.Postgres project with full EF Core migration support for PostgreSQL.
- Implemented automatic database creation and privilege assignment on startup.
- Generated initial migration and model snapshot for PostgreSQL schema.
- Updated build, test, and dependency files to include PostgreSQL provider and Npgsql packages.
- Added PowerShell script for generating and testing PostgreSQL migrations.
- No changes to application logic outside database provider/migration infrastructure.
Refactored all C# test files to use explicit namespace declarations and moved all using directives inside the namespace block for consistency. Updated assembly info and cache files to reflect the new build. Adjusted MvcTestingAppManifest.json to use fully qualified assembly names. No functional changes; all updates are related to code style, organization, and project metadata.