refactor: SOLID architecture — backend service layer + frontend V2 components

## Backend — Service Layer & Repository Refactoring

### Neue Services (21 neue Dateien)

**Interfaces & Implementierungen:**
- `IOpenClawGatewayClient` — Interface für OpenClawGatewayClient (DIP-Fix: DashboardController hing an konkreter Klasse)
- `IAgentConfigService` / `AgentConfigService` — Agent-Config-File-I/O aus AgentsController extrahiert
- `IProjectService` / `ProjectService` — Projekt-CRUD + Activity-Logging (SRP)
- `ITaskService` / `TaskService` — Task-State-Machine, Approve/Reject, Dashboard-Operationen (eliminiert Duplikation zwischen TasksController und DashboardController)
- `IDashboardService` / `DashboardService` — Queue-Aggregation, Priority-Normalisierung, Gateway-Delegation
- `IOperationsService` / `OperationsService` — Metriken-Berechnung aus OperationsController
- `ITeamService` / `TeamService` — IDENTITY.md-Lesen aus TeamController
- `IMemoryService` / `MemoryService` — File-I/O aus MemoryController
- `IIncidentService` / `IncidentService` — File-Parsing (Regex-Source-Generatoren) aus IncidentsController
- `IDocService` / `DocService` — Directory-Scan aus DocsController
- `ICalendarService` / `CalendarService` — Gateway-HTTP-Calls + Fallback-Daten aus CalendarController

### Repository-Fixes

**IUserRepository / UserRepository:**
- `SaveChangesAsync` entfernt (leaky abstraction — Caller sollten nie SaveChanges steuern)
- `RevokeTokenAsync(tokenHash)` — atomares Token-Revoke inkl. SaveChanges
- `RevokeFamilyAsync(familyId)` — Batch-Revoke einer Token-Familie inkl. SaveChanges
- `RemoveExpiredTokensAsync` speichert jetzt selbst (war vorher dependent auf nachfolgenden Save)

### AuthService-Fixes
- `GetUserAsync`: unnötiges `Task.Run` entfernt → direkt `_users.GetByIdAsync().AsTask()`
- `RevokeAsync`: delegiert jetzt an `IUserRepository.RevokeTokenAsync`
- `RefreshAsync`: Token-Reuse-Detection delegiert an `IUserRepository.RevokeFamilyAsync`

### Bug-Fix
- `OpenClawGatewayClient.ReadAgentGoalAsync`: pre-existing `CS1656` behoben (`reader` war `using`-Variable und wurde neu zugewiesen — in `reader2` umbenannt)

### Controller (16 Stück — alle slim)
Alle Controller reduziert auf: Input validieren → Service aufrufen → HTTP-Result zurückgeben.
Kein Business-Logic, kein File-I/O, keine direkte Repository-Nutzung (außer AgentsController für Activity-Log).

**Program.cs — neue Registrierungen:**
- `AddHttpClient<IOpenClawGatewayClient, OpenClawGatewayClient>` (war vorher konkrete Klasse)
- Scoped: IDashboardService, IProjectService, ITaskService, IOperationsService, ITeamService, ICalendarService
- Singleton: IAgentConfigService, IMemoryService, IIncidentService, IDocService

---

## Frontend — Dashboard V2 Components

**AgentDetailModal.vue, IrisChat.vue, TaskStrip.vue:**
- V2 Design-System: Dark Space Theme, Glass-Panels, Gradient-Akzente
- Stores (agents, chat, tasks) nutzen Service + Mapper-Pattern
- NexusLayout, FlowBoard, Topbar — Layoutfixes für fullHeight-Route-Meta

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

backend/Controllers/DocsController.cs

@@ -1,47 +1,15 @@
 using Microsoft.AspNetCore.Mvc;
-using Nexus.Api.Helpers;
+using Nexus.Api.Services;
 
 namespace Nexus.Api.Controllers;
 
 [ApiController]
 [Route("api/v1/docs")]
-public class DocsController : ControllerBase
+public class DocsController(IDocService docService) : ControllerBase
 {
     [HttpGet]
     public IResult GetAll()
-    {
-        var workspaceRoot = "/mnt/workspace-iris";
-        var results = new List<object>();
-
-        void ScanDir(string dir, string category)
-        {
-            if (!Directory.Exists(dir)) return;
-            foreach (var file in Directory.GetFiles(dir, "*.*"))
-            {
-                var ext = Path.GetExtension(file).ToLowerInvariant();
-                if (ext is not (".md" or ".json" or ".txt" or ".yaml" or ".yml" or ".html" or ".css"))
-                    continue;
-                var fi = new FileInfo(file);
-                results.Add(new
-                {
-                    name = fi.Name,
-                    path = file.Replace(workspaceRoot, "").TrimStart('/'),
-                    category,
-                    type = ext.Replace(".", ""),
-                    size = fi.Length,
-                    modifiedAt = fi.LastWriteTimeUtc
-                });
-            }
-        }
-
-        ScanDir("/mnt/workspace-iris/nexus-phases", "phases");
-        ScanDir("/mnt/workspace-iris/skills", "skills");
-        ScanDir("/mnt/workspace-iris", "workspace");
-        ScanDir("/home/node/.openclaw/workspace/nexus", "nexus");
-        ScanDir("/home/node/.openclaw/workspace/nexus/phases", "nexus-phases");
-
-        return Results.Ok(results.OrderByDescending(x => ((DateTime)((dynamic)x).modifiedAt)).Take(100));
-    }
+        => Results.Ok(docService.GetAll());
 
     [HttpGet("{**path}")]
     public async Task<IResult> GetFile(string path)
@@ -49,21 +17,7 @@ public class DocsController : ControllerBase
         if (string.IsNullOrWhiteSpace(path))
             return Results.BadRequest("Path required.");
 
-        string? resolvedPath = null;
-        foreach (var root in new[] { "/mnt/workspace-iris", "/home/node/.openclaw/workspace/nexus" })
-        {
-            if (PathSecurityHelper.TryResolveSafePath(root, path, out var candidate) && System.IO.File.Exists(candidate))
-            {
-                resolvedPath = candidate;
-                break;
-            }
-        }
-
-        if (resolvedPath is null)
-            return Results.NotFound();
-
-        var content = await System.IO.File.ReadAllTextAsync(resolvedPath);
-        var fi = new FileInfo(resolvedPath);
-        return Results.Ok(new { name = fi.Name, path = resolvedPath.Replace("/mnt/workspace-iris/", "").Replace("/home/node/.openclaw/workspace/nexus/", ""), content, size = fi.Length, modifiedAt = fi.LastWriteTimeUtc });
+        var file = await docService.GetFileAsync(path);
+        return file is null ? Results.NotFound() : Results.Ok(file);
     }
 }