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/Repositories/IUserRepository.cs

@@ -10,12 +10,11 @@ public interface IUserRepository
     Task<NexusUser> AddAsync(NexusUser user, CancellationToken ct = default);
     Task UpdateAsync(NexusUser user, CancellationToken ct = default);
 
-    // Refresh token operations
     Task<RefreshToken?> GetRefreshTokenByHashAsync(string tokenHash, CancellationToken ct = default);
     Task<List<RefreshToken>> GetActiveTokensByFamilyAsync(Guid familyId, CancellationToken ct = default);
     Task AddRefreshTokenAsync(RefreshToken token, CancellationToken ct = default);
     Task UpdateRefreshTokenAsync(RefreshToken token, CancellationToken ct = default);
+    Task RevokeTokenAsync(string tokenHash, CancellationToken ct = default);
+    Task RevokeFamilyAsync(Guid familyId, CancellationToken ct = default);
     Task RemoveExpiredTokensAsync(Guid userId, CancellationToken ct = default);
-
-    Task SaveChangesAsync(CancellationToken ct = default);
 }

backend/Repositories/UserRepository.cs

@@ -43,6 +43,33 @@ public sealed class UserRepository(NexusDbContext db) : IUserRepository
     public Task UpdateRefreshTokenAsync(RefreshToken token, CancellationToken ct = default)
         => db.SaveChangesAsync(ct);
 
+    public async Task RevokeTokenAsync(string tokenHash, CancellationToken ct = default)
+    {
+        var token = await db.RefreshTokens.FirstOrDefaultAsync(r => r.TokenHash == tokenHash, ct);
+        if (token is null || token.RevokedAt is not null) return;
+
+        token.RevokedAt = DateTimeOffset.UtcNow;
+        token.ConcurrencyStamp = Guid.NewGuid();
+        await db.SaveChangesAsync(ct);
+    }
+
+    public async Task RevokeFamilyAsync(Guid familyId, CancellationToken ct = default)
+    {
+        var activeTokens = await db.RefreshTokens
+            .Where(r => r.FamilyId == familyId && r.RevokedAt == null)
+            .ToListAsync(ct);
+
+        if (activeTokens.Count == 0) return;
+
+        var now = DateTimeOffset.UtcNow;
+        foreach (var token in activeTokens)
+        {
+            token.RevokedAt = now;
+            token.ConcurrencyStamp = Guid.NewGuid();
+        }
+        await db.SaveChangesAsync(ct);
+    }
+
     public async Task RemoveExpiredTokensAsync(Guid userId, CancellationToken ct = default)
     {
         var cutoff = DateTimeOffset.UtcNow.AddDays(-30);
@@ -51,9 +78,9 @@ public sealed class UserRepository(NexusDbContext db) : IUserRepository
             .ToListAsync(ct);
 
         if (oldTokens.Count > 0)
+        {
             db.RefreshTokens.RemoveRange(oldTokens);
+            await db.SaveChangesAsync(ct);
+        }
     }
-
-    public Task SaveChangesAsync(CancellationToken ct = default)
-        => db.SaveChangesAsync(ct);
 }