Agent-Persona auf File-Basis umgestellt (IDENTITY.md, SOUL.md, USER.md)

- Persona/Instructions DB-Felder aus AgentRecord, DB-Queries, API und Frontend entfernt
- SystemPromptBuilder liest jetzt IDENTITY.md + SOUL.md aus data/agents/{agentId}/
- Globale USER.md aus data/ wird in jeden System-Prompt injiziert
- MemoryService.DataDir als public Property exponiert
- Denker: IDENTITY.md + SOUL.md erstellt
- Meleki: Migrations-Vorlagen unter migration/meleki/ angelegt
- USER.md global unter publish/data/ erstellt

Services/DatabaseService.cs

@@ -148,8 +148,8 @@ public class DatabaseService
         agent.CreatedAt = now;
         agent.UpdatedAt = now;
         await conn.ExecuteAsync(@"
-            INSERT INTO agents (agent_id, name, avatar, description, model, persona, instructions, tool_choice, custom_commands, auto_commit, is_deleted, created_at, updated_at)
-            VALUES (@AgentId, @Name, @Avatar, @Description, @Model, @Persona, @Instructions, @ToolChoice, @CustomCommands, @AutoCommit, 0, @CreatedAt, @UpdatedAt)
+            INSERT INTO agents (agent_id, name, avatar, description, model, tool_choice, custom_commands, auto_commit, is_deleted, created_at, updated_at)
+            VALUES (@AgentId, @Name, @Avatar, @Description, @Model, @ToolChoice, @CustomCommands, @AutoCommit, 0, @CreatedAt, @UpdatedAt)
         ", agent);
         return agent;
     }
@@ -174,7 +174,7 @@ public class DatabaseService
         agent.UpdatedAt = DateTime.UtcNow.ToString("o");
         await conn.ExecuteAsync(@"
             UPDATE agents SET name = @Name, avatar = @Avatar, description = @Description,
-                model = @Model, persona = @Persona, instructions = @Instructions, tool_choice = @ToolChoice,
+                model = @Model, tool_choice = @ToolChoice,
                 custom_commands = @CustomCommands, auto_commit = @AutoCommit, updated_at = @UpdatedAt
             WHERE agent_id = @AgentId
         ", agent);