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

src/Jellyfin.Database/Jellyfin.Database.Providers.Postgres/PostgresDatabaseProvider.cs

@@ -34,6 +34,7 @@ public sealed class PostgresDatabaseProvider : IJellyfinDatabaseProvider
     private readonly IConfigurationManager? configurationManager;
     private PostgresBackupService? backupService;
     private string? currentHost;
+    private DatabaseConfigurationOptions? databaseConfig;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="PostgresDatabaseProvider"/> class.
@@ -93,6 +94,9 @@ public sealed class PostgresDatabaseProvider : IJellyfinDatabaseProvider
     /// <inheritdoc/>
     public void Initialise(DbContextOptionsBuilder options, DatabaseConfigurationOptions databaseConfiguration)
     {
+        // Store the configuration for later use
+        databaseConfig = databaseConfiguration;
+
         static T? GetOption<T>(ICollection<CustomDatabaseOption>? options, string key, Func<string, T> converter, Func<T>? defaultValue = null)
         {
             if (options is null)
@@ -337,6 +341,16 @@ public sealed class PostgresDatabaseProvider : IJellyfinDatabaseProvider
     {
         try
         {
+            // First ensure the database itself exists
+            if (databaseConfig is not null)
+            {
+                await EnsureDatabaseExistsAsync(databaseConfig, cancellationToken).ConfigureAwait(false);
+            }
+            else
+            {
+                logger.LogWarning("Database configuration not available. Database existence check skipped.");
+            }
+
             logger.LogInformation("Checking PostgreSQL database for missing tables...");
 
             var context = await DbContextFactory!.CreateDbContextAsync(cancellationToken).ConfigureAwait(false);