feat: v1.1.8 — user-server assignment, VM/LXC ownership, smart login redirect, RBAC migrations

- Migration 20: user_servers association table (User ↔ ProxmoxServer)
- API: GET/PUT /api/users/{id}/servers — assign servers to users with workspace-conflict validation
- API: GET /api/users/{id}/server-assignments — enriched server list (assigned + compatible flags)
- Non-admin server filter: intersection of assigned_servers and workspace servers
- Migration 21: dashboard:view = false for user role (new key format)
- Migration 22: proxmox.cluster.manage → cluster:manage for admin role
- API: GET/PUT /api/{server_id}/vm/{vmid}/owner — VM/LXC owner assignment (admin-only)
- Login: smart redirect based on user permissions after authentication
- Login: returnUrl param support for post-login redirect
- Roles API: user_count field per role in GET /api/roles
- node_uptime added to server detail API response
- Remove redundant PermissionChecker from GET /users HTML route

backend/app/api/dashboard.py

@@ -8,7 +8,7 @@ from datetime import datetime, timedelta
 from ..db import get_db
 from ..models import ProxmoxServer, AuditLog, User
 from ..template_helpers import add_i18n_context
-from ..auth import get_current_user, PermissionChecker
+from ..auth import PermissionChecker
 
 router = APIRouter()
 templates = Jinja2Templates(directory="app/templates")
@@ -63,7 +63,7 @@ def dashboard(request: Request, db: Session = Depends(get_db)):
         standalone_q = standalone_q.filter(ProxmoxServer.id.in_(server_ids))
     named_clusters = cluster_q.scalar() or 0
     standalone_count = standalone_q.count()
-    total_clusters = named_clusters + standalone_count
+    total_clusters = named_clusters
 
     # Alerts in last 24 hours
     since_24h = datetime.utcnow() - timedelta(hours=24)