Jellyfin 11.0.0-PostgreSQL PREVIEW: version bump & defaults

- Update version to 11.0.0-PostgreSQL-PREVIEW in assemblies, installer, and build scripts
- Default web directory is now "wwwroot" across all platforms
- Configuration manager now creates .example files if missing
- Set PostgreSQL as default database with sensible options
- Postgres provider ensures database exists before table checks
- Add docs for marker conflict fixes and startup.json path issues
- Version string in logs/UI uses informational version
- Installer output filename and wizard show PREVIEW suffix
- Documentation summarizes version bump and verification steps

Jellyfin.Server/Program.cs

@@ -113,9 +113,11 @@ namespace Jellyfin.Server
             AppDomain.CurrentDomain.UnhandledException += (_, e)
                 => _logger.LogCritical((Exception)e.ExceptionObject, "Unhandled Exception");
 
-            _logger.LogInformation(
-                "Jellyfin version: {Version}",
-                Assembly.GetEntryAssembly()!.GetName().Version!.ToString(3));
+            var entryAssembly = Assembly.GetEntryAssembly()!;
+            var versionString = entryAssembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion
+                ?? entryAssembly.GetName().Version!.ToString(3);
+
+            _logger.LogInformation("Jellyfin version: {Version}", versionString);
 
             StartupHelpers.LogEnvironmentInfo(_logger, appPaths);