fix(auth): make the owner role real — provisioning, staff doors, panel guards

Found live while verifying the admin email-edit fix: the Owner account could
not load /api/v1/users at all. Root cause: migration 0011 adds the 'owner'
role and gates every user-administration route on it, but NOTHING ever wrote
it. break-glass (UpsertOwner), the setup MC-bind (CompleteOwnerSetup), and the
re-provision path all forced 'admin', so in a fresh install the entire
owner tier — list/create/edit/disable/delete users, quotas, sessions — was
unreachable. The role was a dead letter in the other direction too: staff
predicates that predate the role did not know it.

- UpsertOwner and CompleteOwnerSetup now write role='owner'; the username-
  conflict arm re-asserts it, which is also the documented pre-0011 promotion
  path ("re-provision via break-glass"). InsertOperator stays plain 'admin'.
- Staff doors learn the role: op-login start/finish admit the Owner; the
  player email door refuses it like any staff account; the in-game approver
  check already used staffRole.
- Reclaim protection: IsProtectedAdminLink (and the break-glass bootstrap
  switch AdminExists) count admin OR owner — the Owner must never be displaced
  by a Mojang-priority reclaim.
- Panel guards make migration 0011's claim true now that owner rows exist: an
  owner can never be demoted, deleted, or disabled through the API (only the
  local break-glass console resets the identity); username/email edits still
  work.

Tests: pgint pins both provisioning paths, the protected-link predicate and
the reset/promote semantics; hermetic suites cover the owner-admitting staff
door, the owner-refusing player door, the three panel guards, and break-glass
attribution.

cmd/felis/breakglass_test.go

@@ -264,6 +264,16 @@ func TestAuthenticateAdmin(t *testing.T) {
 		}
 	})
 
+	t.Run("the owner role attributes like an admin", func(t *testing.T) {
+		owner := mkAdmin("root")
+		owner.Role = "owner" // the platform owner is staff too (migration 0011)
+		f := &fakeOwnerStore{users: map[string]*api.StaffUser{"root": owner}}
+		matched, ok, err := authenticateAdmin(ctx, f, "root")
+		if err != nil || !ok || matched != "root" {
+			t.Fatalf("authenticateAdmin(owner) = (%q, %v, %v), want (root, true, nil)", matched, ok, err)
+		}
+	})
+
 	t.Run("an unknown user is a non-match, not an error", func(t *testing.T) {
 		f := &fakeOwnerStore{}
 		_, ok, err := authenticateAdmin(ctx, f, "nobody")