Handle Qdrant startup failures gracefully (#683)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Databases/DatabaseClient.cs

@@ -3,6 +3,8 @@
 public abstract class DatabaseClient(string name, string path)
 {
     public string Name => name;
+
+    public virtual bool IsAvailable => true;
     
     private string Path => path;
 

app/MindWork AI Studio/Tools/Databases/NoDatabaseClient.cs

@@ -0,0 +1,24 @@
+using AIStudio.Tools.PluginSystem;
+
+namespace AIStudio.Tools.Databases;
+
+public sealed class NoDatabaseClient(string name, string? unavailableReason) : DatabaseClient(name, string.Empty)
+{
+    private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(NoDatabaseClient).Namespace, nameof(NoDatabaseClient));
+    
+    public override bool IsAvailable => false;
+
+    public override async IAsyncEnumerable<(string Label, string Value)> GetDisplayInfo()
+    {
+        yield return (TB("Status"), TB("Unavailable"));
+
+        if (!string.IsNullOrWhiteSpace(unavailableReason))
+            yield return (TB("Reason"), unavailableReason);
+
+        await Task.CompletedTask;
+    }
+
+    public override void Dispose()
+    {
+    }
+}

app/MindWork AI Studio/Tools/Databases/Qdrant/QdrantClientImplementation.cs

@@ -43,8 +43,8 @@ public class QdrantClientImplementation : DatabaseClient
 
     private async Task<string> GetVersion()
     {
-        var operation =  await this.GrpcClient.HealthAsync();
-        return "v"+operation.Version;
+        var operation = await this.GrpcClient.HealthAsync();
+        return $"v{operation.Version}";
     }
 
     private async Task<string> GetCollectionsAmount()

app/MindWork AI Studio/Tools/Rust/QdrantInfo.cs

@@ -5,6 +5,10 @@
 /// </summary>
 public readonly record struct QdrantInfo
 {
+    public bool IsAvailable { get; init; }
+
+    public string? UnavailableReason { get; init; }
+
     public string Path { get; init; }
     
     public int PortHttp { get; init; }