fix(banded ssid): treat "PPSK not on this band" as a quiet skip

The sibling-rotation path's "Embedded PPSK not found" error was being
surfaced to the operator as a failure, but it's not — it just means
the PPSK isn't mirrored on that band (GUEST was configured on one
band only, which is a perfectly valid setup). Logging this as a
sibling failure also poisoned the cron run status to "partial".

Now: "not found"-style errors from updateEmbeddedPpsk on a sibling
become info-level log entries and the loop continues. Other errors
(API failures, permissions, etc.) still surface as warnings/failures.

v1.10.1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Http/Controllers/WifiController.php

@@ -314,7 +314,11 @@ class WifiController extends Controller
                                     ]);
                                 }
                             } catch (\Throwable $e) {
-                                \Illuminate\Support\Facades\Log::warning('unifi.ppsk_sibling_update_failed', [
+                                // PPSK absent on this band is fine — just
+                                // means it isn't mirrored. Anything else
+                                // gets warning-logged.
+                                $level = str_contains($e->getMessage(), 'not found') ? 'info' : 'warning';
+                                \Illuminate\Support\Facades\Log::log($level, 'unifi.ppsk_sibling_update', [
                                     'sibling_wlan' => $siblingWlanId,
                                     'error'        => $e->getMessage(),
                                 ]);