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

Jellyfin.Server.Implementations/Security/AuthorizationContext.cs

@@ -83,6 +83,15 @@ namespace Jellyfin.Server.Implementations.Security
             IHeaderDictionary headers,
             IQueryCollection queryString)
         {
+            // Token extraction priority (in order):
+            // 1. Authorization header (MediaBrowser Token parameter)
+            // 2. X-Emby-Token header (if legacy auth enabled)
+            // 3. X-MediaBrowser-Token header (if legacy auth enabled)
+            // 4. ApiKey query parameter
+            // 5. api_key query parameter (if legacy auth enabled)
+            // For WebSocket connections, use query parameters:
+            // ws://server:port/path?api_key=YOUR_TOKEN
+
             string? deviceId = null;
             string? deviceName = null;
             string? client = null;