fix(panel): mark platform system services read-only in the fleet table

login/lobby carry reserved names, so every per-server route rejects them —
yet the cockpit offered claim/stop/wake and a console link on their rows,
each answering 400 bad_name. The fleet view now marks them (system:true,
shared naming.IsSystemServer) and the panel renders a plain label instead
of dead actions.

internal/api/api_test.go

@@ -1809,6 +1809,44 @@ func TestFleetAdminRead(t *testing.T) {
 		}
 	})
 
+	t.Run("system services are marked read-only", func(t *testing.T) {
+		// The login gate and the lobby carry reserved names, so every per-server
+		// route rejects them; the fleet row must say "system" so the cockpit
+		// renders them without actions that would 400.
+		sysCl := newFakeCluster()
+		sysCl.list = []ServerInfo{
+			{Name: "login", Phase: "Running", Ready: true},
+			{Name: "lobby", Phase: "Running", Ready: true},
+			{Name: "survival", Phase: "Stopped"},
+		}
+		api := newTestAPI(newFakeRepo(), sysCl)
+		api.External = staticExternal{p: &Principal{UserID: "a1", Email: "[email protected]",
+			Role: "admin", ViaAdminAccess: true}}
+		w := do(api.ExternalHandler(), "GET", "/api/v1/fleet", "", nil)
+		if w.Code != http.StatusOK {
+			t.Fatalf("code = %d, want 200 (%s)", w.Code, w.Body.String())
+		}
+		var got struct {
+			Servers []struct {
+				Name   string `json:"name"`
+				System bool   `json:"system"`
+			} `json:"servers"`
+		}
+		if err := json.Unmarshal(w.Body.Bytes(), &got); err != nil {
+			t.Fatalf("body not JSON: %v", err)
+		}
+		byName := map[string]bool{}
+		for _, r := range got.Servers {
+			byName[r.Name] = r.System
+		}
+		if !byName["login"] || !byName["lobby"] {
+			t.Errorf("system flags = %+v, want login+lobby marked", byName)
+		}
+		if byName["survival"] {
+			t.Errorf("survival marked system; only platform services are")
+		}
+	})
+
 	t.Run("owner merges for claimed, absent for unclaimed", func(t *testing.T) {
 		repo := newFakeRepo()
 		// Only "survival" is claimed; "creative"/"skyblock" stay unowned.

internal/api/handlers_user.go

@@ -259,7 +259,8 @@ func (a *API) handleFleet(w http.ResponseWriter, r *http.Request) {
 	owners, _ := a.Repo.ServerOwners(r.Context())
 	views := make([]fleetServerView, len(servers))
 	for i, s := range servers {
-		views[i] = fleetServerView{ServerInfo: s, Owner: owners[s.Name]}
+		views[i] = fleetServerView{ServerInfo: s, Owner: owners[s.Name],
+			System: naming.IsSystemServer(s.Name)}
 	}
 	writeJSON(w, http.StatusOK, map[string]any{"servers": views})
 }
@@ -267,13 +268,18 @@ func (a *API) handleFleet(w http.ResponseWriter, r *http.Request) {
 // fleetServerView is one row of the SysAdmin cockpit's fleet read: the CRD
 // lifecycle view (ServerInfo, §1 authority) with the owner's display identity
 // joined alongside. The embed keeps every lifecycle field flat in the JSON so the
-// shape is a strict superset of ServerInfo; Owner is the only addition.
+// shape is a strict superset of ServerInfo.
 type fleetServerView struct {
 	ServerInfo
 	// Owner is the claiming user's display identity (email, or username when the
 	// address is absent), or "" when the server is unclaimed or the best-effort
 	// owner lookup failed — the cockpit renders "" as "unclaimed".
 	Owner string `json:"owner,omitempty"`
+	// System marks a platform-provisioned system service (the login gate and the
+	// lobby, naming.IsSystemServer). Their names are reserved, so every per-server
+	// API route rejects them — the cockpit must render them read-only rather than
+	// offer claim/wake/stop/console actions that would answer 400.
+	System bool `json:"system,omitempty"`
 }
 
 // createServerRequest is the structured §15 create-server form. This is the