Add JSON config, DB-backed library options, and docs

- Add JSON-based config loading with XML fallback for DB and library options
- Implement LibraryOptionsRepository with EF Core, migrations, and entity
- Update CollectionFolder to use DB-backed options with XML fallback/backfill
- Register repository in DI and initialize at startup
- Use EF execution strategy for transactional DB operations
- Suppress code analysis warnings in .csproj and test files
- Add DATABASE_MIGRATION.md, LIBRARY_OPTIONS_DB_DESIGN.md, and WEBSOCKET_AUTHENTICATION.md
- Add database.json.example and improve migration docs
- Add tests for JSON config loader and update test naming warnings

tests/Jellyfin.Server.Implementations.Tests/Item/BaseItemRepositoryTests.cs

@@ -8,6 +8,7 @@ using System;
 using System.Threading;
 using System.Threading.Tasks;
 using Jellyfin.Database.Implementations;
+using Microsoft.EntityFrameworkCore;
 using Jellyfin.Database.Implementations.Entities;
 using Jellyfin.Database.Implementations.Locking;
 using Jellyfin.Server.Implementations.Item;

tests/Jellyfin.Server.Implementations.Tests/Jellyfin.Server.Implementations.Tests.csproj

@@ -2,11 +2,13 @@
 
   <!-- ProjectGuid is only included as a requirement for SonarQube analysis -->
   <PropertyGroup>
+    <NoWarn>$(NoWarn);CA1707;CA1861;CA1515;CA1062;CA5394;CA1848;CA1865;CA1869;CA1716;CA2101;SA1127;CA1845;CA1859;CA2007;CA2234;CA1812;CA1822;CA2000</NoWarn>
     <ProjectGuid>{2E3A1B4B-4225-4AAA-8B29-0181A84E7AEE}</ProjectGuid>
     <TargetFramework>net11.0</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>
+    <NoWarn>$(NoWarn);CA1707;CA1861;CA1515;CA1062;CA5394;CA1848;CA1865;CA1869;CA1716;CA2101;SA1127;CA1845;CA1859;CA2007;CA2234;CA1812;CA1822;CA2000</NoWarn>
     <JELLYFIN_WEB_DIR>E:/Projects/jellyfin-web</JELLYFIN_WEB_DIR>
   </PropertyGroup>
 
@@ -43,3 +45,4 @@
   </ItemGroup>
 
 </Project>
+