feat: Public-Flag für Agents + verfügbare Agents/Bots Endpoints erweitert

- AgentRecord: neues IsPublic-Feld mit DB-Migration
- GET /api/agents/available: eigene + public Agents (alle Properties + isOwner)
- GET /api/telegram/bots/available: alle Properties außer Token/Secret + sessionCount
- Agent-Page: Public-Checkbox (andere User können Agent in Sessions verwenden)
- Dashboard: agentMap aus availableAgents gebaut (public Agents fremder User auflösbar)
- Session-Page + Cronjob-Page: Agent-Picker nutzt /available statt /agents
- Agent-Cards: Public- und Fremd-Badges
- Fix: Chat-Button bei Sessions mit public Agent eines anderen Users nicht mehr disabled

Endpoints/AgentEndpoint.cs

@@ -16,6 +16,7 @@ public static class AgentEndpoint
     public static void MapAgentEndpoints(this IEndpointRouteBuilder app)
     {
         app.MapGet("/api/agents", HandleList);
+        app.MapGet("/api/agents/available", HandleListAvailable);
         app.MapGet("/api/agents/{agentId}", HandleGet);
         app.MapPost("/api/agents", HandleCreate);
         app.MapPut("/api/agents/{agentId}", HandleUpdate);
@@ -59,6 +60,7 @@ public static class AgentEndpoint
                 a.AvatarScale,
                 a.AvatarOffsetX,
                 a.AvatarOffsetY,
+                a.IsPublic,
                 a.IsDeleted,
                 a.CreatedAt,
                 a.UpdatedAt,
@@ -69,6 +71,55 @@ public static class AgentEndpoint
         await ctx.Response.WriteAsJsonAsync(results);
     }
 
+    private static async Task HandleListAvailable(HttpContext ctx, DatabaseService db, SkillService skillService)
+    {
+        var userId = ctx.GetUserId();
+        var agents = await db.GetAvailableAgents(userId);
+        var allSkills = skillService.GetAllSkills();
+        var skillMap = allSkills.ToDictionary(s => s.Slug);
+
+        var results = new List<object>();
+        foreach (var a in agents)
+        {
+            var agentSkillSlugs = await db.GetAgentSkills(a.AgentId);
+            var skills = agentSkillSlugs
+                .Where(slug => skillMap.ContainsKey(slug))
+                .Select(slug => new { slug, name = skillMap[slug].Name, description = skillMap[slug].Description })
+                .ToList();
+
+            results.Add(new
+            {
+                a.AgentId,
+                a.Name,
+                Avatar = a.AvatarSmall ?? a.Avatar,
+                a.Description,
+                a.Model,
+                a.ToolChoice,
+                a.CustomCommands,
+                a.AutoCommit,
+                a.UseSoul,
+                a.UseIdentity,
+                a.UseUserInfo,
+                a.UseMemory,
+                a.UseWebSearch,
+                a.WebSearchVersion,
+                a.AllowUserChoice,
+                a.TaskInstruction,
+                a.AvatarScale,
+                a.AvatarOffsetX,
+                a.AvatarOffsetY,
+                a.IsPublic,
+                a.IsDeleted,
+                a.CreatedAt,
+                a.UpdatedAt,
+                IsOwner = a.UserId == userId,
+                Skills = skills
+            });
+        }
+
+        await ctx.Response.WriteAsJsonAsync(results);
+    }
+
     private static async Task HandleGet(HttpContext ctx, DatabaseService db)
     {
         var agentId = ctx.Request.RouteValues["agentId"]?.ToString();
@@ -112,7 +163,8 @@ public static class AgentEndpoint
             TaskInstruction = body.TryGetProperty("taskInstruction", out var ti) ? ti.GetString() : null,
             AvatarScale = body.TryGetProperty("avatarScale", out var asc) ? asc.GetDouble() : 1.0,
             AvatarOffsetX = body.TryGetProperty("avatarOffsetX", out var aox) ? aox.GetDouble() : 0,
-            AvatarOffsetY = body.TryGetProperty("avatarOffsetY", out var aoy) ? aoy.GetDouble() : 0
+            AvatarOffsetY = body.TryGetProperty("avatarOffsetY", out var aoy) ? aoy.GetDouble() : 0,
+            IsPublic = body.TryGetProperty("isPublic", out var ip) && ip.GetBoolean()
         };
 
         agent = await db.CreateAgent(agent);
@@ -157,6 +209,7 @@ public static class AgentEndpoint
         if (body.TryGetProperty("avatarScale", out var asc)) agent.AvatarScale = asc.GetDouble();
         if (body.TryGetProperty("avatarOffsetX", out var aox)) agent.AvatarOffsetX = aox.GetDouble();
         if (body.TryGetProperty("avatarOffsetY", out var aoy)) agent.AvatarOffsetY = aoy.GetDouble();
+        if (body.TryGetProperty("isPublic", out var ip)) agent.IsPublic = ip.GetBoolean();
 
         await db.UpdateAgent(agent);
         memoryService.InitializeAgentFiles(agentId, agent.Name);