feat: MCP-Tools ask_user_choice + memory_read/write/list, Text-Marker entfernt

MCP-Server erweitert um ask_user_choice (Long-Poll), memory_read, memory_write
und memory_list Tools. MCP-Config wird jetzt immer generiert (nicht nur bei
Remote-Verbindung). InternalEndpoint um PendingChoices + choice-respond Endpoint
ergänzt. Frontend differenziert CLI-Modus (choice-respond API) vs. API-Modus.
Gesamter :::ASK_USER_CHOICE::: Text-Marker-Mechanismus aus ClaudeCliService,
AnthropicService, markdown.js und stream-ui.js entfernt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Endpoints/InternalEndpoint.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Collections.Concurrent;
 using System.IO;
 using System.Linq;
 using System.Text.Json;
@@ -19,11 +21,22 @@ public static class InternalEndpoint
     /// <summary>
     /// Interner Auth-Token – wird beim Start generiert und an MCP-Server übergeben.
     /// </summary>
-    public static string InternalToken { get; } = System.Guid.NewGuid().ToString("N");
+    public static string InternalToken { get; } = Guid.NewGuid().ToString("N");
+
+    /// <summary>
+    /// Pending user choices – Key ist sessionId, Value wird completed wenn der User klickt.
+    /// </summary>
+    public static readonly ConcurrentDictionary<string, TaskCompletionSource<string>> PendingChoices = new();
 
     public static void MapInternalEndpoints(this IEndpointRouteBuilder app)
     {
         app.MapPost("/api/internal/remote-execute", HandleRemoteExecute);
+        app.MapPost("/api/internal/ask-user-choice", HandleAskUserChoice);
+        // choice-respond ist NICHT unter /api/internal/ weil es vom Frontend aufgerufen wird (normale Auth)
+        app.MapPost("/api/chat/choice-respond", HandleChoiceRespond);
+        app.MapPost("/api/internal/memory-read", HandleMemoryRead);
+        app.MapPost("/api/internal/memory-write", HandleMemoryWrite);
+        app.MapPost("/api/internal/memory-list", HandleMemoryList);
     }
 
     private static async Task<IResult> HandleRemoteExecute(HttpContext ctx, RemoteConnectionManager mgr)
@@ -70,4 +83,194 @@ public static class InternalEndpoint
             return Results.Json(new { error = ex.Message, stackTrace = ex.StackTrace }, statusCode: 500);
         }
     }
+
+    /// <summary>
+    /// MCP-Server ruft diesen Endpoint auf und blockiert bis der User eine Auswahl trifft.
+    /// Der TCS wird vorher von AnthropicService erstellt (beim tool_use Event).
+    /// </summary>
+    private static async Task<IResult> HandleAskUserChoice(HttpContext ctx)
+    {
+        try
+        {
+            var denied = CheckToken(ctx);
+            if (denied != null) return denied;
+
+            using var reader = new StreamReader(ctx.Request.Body);
+            var body = await reader.ReadToEndAsync();
+            JsonElement json;
+            try { json = JsonSerializer.Deserialize<JsonElement>(body); }
+            catch { return Results.BadRequest(new { error = "Invalid JSON" }); }
+
+            var sessionId = json.TryGetProperty("sessionId", out var sid) ? sid.GetString() ?? "" : "";
+            if (string.IsNullOrEmpty(sessionId))
+                return Results.BadRequest(new { error = "sessionId erforderlich" });
+
+            // Warte auf den TCS der von AnthropicService erstellt wurde
+            if (!PendingChoices.TryGetValue(sessionId, out var tcs))
+            {
+                // TCS noch nicht erstellt (Race Condition) – kurz warten und nochmal probieren
+                for (int i = 0; i < 10; i++)
+                {
+                    await Task.Delay(500, ctx.RequestAborted);
+                    if (PendingChoices.TryGetValue(sessionId, out tcs)) break;
+                }
+                if (tcs == null)
+                    return Results.Json(new { error = "Keine ausstehende Auswahl für diese Session" }, statusCode: 404);
+            }
+
+            // Blockieren bis User antwortet (max 5 Minuten)
+            using var cts = CancellationTokenSource.CreateLinkedTokenSource(ctx.RequestAborted);
+            cts.CancelAfter(TimeSpan.FromMinutes(5));
+
+            try
+            {
+                var choice = await tcs.Task.WaitAsync(cts.Token);
+                PendingChoices.TryRemove(sessionId, out _);
+                return Results.Ok(new { choice });
+            }
+            catch (OperationCanceledException)
+            {
+                PendingChoices.TryRemove(sessionId, out _);
+                return Results.Json(new { error = "Timeout – keine Auswahl getroffen" }, statusCode: 408);
+            }
+        }
+        catch (Exception ex)
+        {
+            return Results.Json(new { error = ex.Message }, statusCode: 500);
+        }
+    }
+
+    /// <summary>
+    /// Frontend ruft diesen Endpoint auf wenn der User einen Choice-Button klickt (CLI-Modus).
+    /// </summary>
+    private static async Task<IResult> HandleChoiceRespond(HttpContext ctx)
+    {
+        try
+        {
+            // Kein Token-Check – wird über normale Auth-Middleware geschützt (Cookie-basiert)
+            using var reader = new StreamReader(ctx.Request.Body);
+            var body = await reader.ReadToEndAsync();
+            JsonElement json;
+            try { json = JsonSerializer.Deserialize<JsonElement>(body); }
+            catch { return Results.BadRequest(new { error = "Invalid JSON" }); }
+
+            var sessionId = json.TryGetProperty("sessionId", out var sid) ? sid.GetString() ?? "" : "";
+            var choice = json.TryGetProperty("choice", out var c) ? c.GetString() ?? "" : "";
+
+            if (string.IsNullOrEmpty(sessionId))
+                return Results.BadRequest(new { error = "sessionId erforderlich" });
+            if (string.IsNullOrEmpty(choice))
+                return Results.BadRequest(new { error = "choice erforderlich" });
+
+            if (PendingChoices.TryGetValue(sessionId, out var tcs))
+            {
+                tcs.TrySetResult(choice);
+                return Results.Ok(new { success = true });
+            }
+
+            return Results.NotFound(new { error = "Keine ausstehende Auswahl für diese Session" });
+        }
+        catch (Exception ex)
+        {
+            return Results.Json(new { error = ex.Message }, statusCode: 500);
+        }
+    }
+
+    private static IResult CheckToken(HttpContext ctx)
+    {
+        var token = ctx.Request.Headers["X-Internal-Token"].FirstOrDefault() ?? "";
+        return token != InternalToken ? Results.StatusCode(403) : null;
+    }
+
+    private static async Task<IResult> HandleMemoryRead(HttpContext ctx, MemoryService memoryService)
+    {
+        try
+        {
+            var denied = CheckToken(ctx);
+            if (denied != null) return denied;
+
+            using var reader = new StreamReader(ctx.Request.Body);
+            var body = await reader.ReadToEndAsync();
+            JsonElement json;
+            try { json = JsonSerializer.Deserialize<JsonElement>(body); }
+            catch { return Results.BadRequest(new { error = "Invalid JSON" }); }
+
+            var agentId = json.TryGetProperty("agentId", out var a) ? a.GetString() ?? "" : "";
+            var path = json.TryGetProperty("path", out var p) ? p.GetString() ?? "" : "";
+
+            if (string.IsNullOrEmpty(agentId)) return Results.BadRequest(new { error = "agentId erforderlich" });
+            if (string.IsNullOrEmpty(path)) return Results.BadRequest(new { error = "path erforderlich" });
+
+            var content = memoryService.ReadMemoryFile(agentId, path);
+            if (content == null)
+                return Results.NotFound(new { error = $"Datei nicht gefunden: {path}" });
+
+            return Results.Ok(new { content });
+        }
+        catch (System.Exception ex)
+        {
+            return Results.Json(new { error = ex.Message }, statusCode: 500);
+        }
+    }
+
+    private static async Task<IResult> HandleMemoryWrite(HttpContext ctx, MemoryService memoryService)
+    {
+        try
+        {
+            var denied = CheckToken(ctx);
+            if (denied != null) return denied;
+
+            using var reader = new StreamReader(ctx.Request.Body);
+            var body = await reader.ReadToEndAsync();
+            JsonElement json;
+            try { json = JsonSerializer.Deserialize<JsonElement>(body); }
+            catch { return Results.BadRequest(new { error = "Invalid JSON" }); }
+
+            var agentId = json.TryGetProperty("agentId", out var a) ? a.GetString() ?? "" : "";
+            var path = json.TryGetProperty("path", out var p) ? p.GetString() ?? "" : "";
+            var content = json.TryGetProperty("content", out var c) ? c.GetString() ?? "" : "";
+            var append = json.TryGetProperty("append", out var ap) && ap.GetBoolean();
+
+            if (string.IsNullOrEmpty(agentId)) return Results.BadRequest(new { error = "agentId erforderlich" });
+            if (string.IsNullOrEmpty(path)) return Results.BadRequest(new { error = "path erforderlich" });
+
+            if (append)
+                memoryService.AppendMemoryFile(agentId, path, content);
+            else
+                memoryService.WriteMemoryFile(agentId, path, content);
+
+            return Results.Ok(new { success = true, message = $"Memory-Datei {(append ? "erweitert" : "geschrieben")}: {path} ({content.Length} Zeichen)" });
+        }
+        catch (System.Exception ex)
+        {
+            return Results.Json(new { error = ex.Message }, statusCode: 500);
+        }
+    }
+
+    private static async Task<IResult> HandleMemoryList(HttpContext ctx, MemoryService memoryService)
+    {
+        try
+        {
+            var denied = CheckToken(ctx);
+            if (denied != null) return denied;
+
+            using var reader = new StreamReader(ctx.Request.Body);
+            var body = await reader.ReadToEndAsync();
+            JsonElement json;
+            try { json = JsonSerializer.Deserialize<JsonElement>(body); }
+            catch { return Results.BadRequest(new { error = "Invalid JSON" }); }
+
+            var agentId = json.TryGetProperty("agentId", out var a) ? a.GetString() ?? "" : "";
+            var subPath = json.TryGetProperty("path", out var p) ? p.GetString() ?? "" : "";
+
+            if (string.IsNullOrEmpty(agentId)) return Results.BadRequest(new { error = "agentId erforderlich" });
+
+            var files = memoryService.ListMemoryFiles(agentId, subPath);
+            return Results.Ok(new { files });
+        }
+        catch (System.Exception ex)
+        {
+            return Results.Json(new { error = ex.Message }, statusCode: 500);
+        }
+    }
 }