feat(tickets): Rückfragen-Dialog, Verlinkungen, Entwurfssicherung + PWA-Vorbereitung

- Feedback: fixNote (Changelog), agentContext (intern), thread (Q&A-Verlauf);
  3 gefilterte Ansichten (Rückfragen/Offen/Geschlossen)
- Tickets-Text: klickbare Tier-Links (ID→Name), Ticket→Ticket-Links (?focus=),
  Markdown-Links; Antwort-Entwurf pro Ticket in localStorage
- "Fehler melden": Entwurf übersteht App-Wechsel/Schließen (ein gemeinsamer Entwurf)
- entityName als Hyperlink zum referenzierten Datensatz

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

GerbilManagerWebAPI/Dtos/FeedbackDtos.cs

@@ -11,6 +11,15 @@ namespace GerbilManagerWebAPI.Dtos
         string? Url,
         DateTimeOffset? ClientTimestamp);
 
+    /// <summary>
+    /// FEEDBACK: one past Q&A turn in the ticket's thread/history.
+    /// Role is "maintainer" (Rückfrage) or "breeder" (Antwort).
+    /// </summary>
+    public record FeedbackThreadEntry(
+        string Role,
+        string Text,
+        DateTimeOffset? At);
+
     /// <summary>FEEDBACK: response DTO for a stored report.</summary>
     public record FeedbackDto(
         Guid Id,
@@ -28,15 +37,24 @@ namespace GerbilManagerWebAPI.Dtos
         DateTimeOffset? ResolvedAt,
         string? Question,
         string? Answer,
-        DateTimeOffset? AnsweredAt);
+        DateTimeOffset? AnsweredAt,
+        /// <summary>Breeder-friendly changelog written on resolve (shown in the UI).</summary>
+        string? FixNote,
+        /// <summary>INTERNAL agent working memory — exposed for tooling, NEVER shown to the breeder.</summary>
+        string? AgentContext,
+        /// <summary>Earlier Q&A rounds, oldest first; the current open exchange stays in Question/Answer.</summary>
+        IReadOnlyList<FeedbackThreadEntry> Thread);
 
     /// <summary>
     /// FEEDBACK: payload for PUT /feedback/{id}. Edit the message and/or toggle status,
-    /// attach a clarifying question (Rückfrage), or submit the breeder's answer.
+    /// attach a clarifying question (Rückfrage), submit the breeder's answer, set the
+    /// breeder-friendly fix note (changelog), or update the internal agent context.
     /// </summary>
     public record FeedbackUpdate(
         string? Message,
         string? Status,
         string? Question,
-        string? Answer);
+        string? Answer,
+        string? FixNote,
+        string? AgentContext);
 }