fix: auto-create company logo directory on upload

With MySQL migration, data/companies/{id}/ directories may not exist.
Now creates directory automatically instead of returning 404.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api.php

@@ -720,13 +720,13 @@ switch ($action) {
         $ext = $extMap[$detectedType] ?? 'png';
         $newFilename = 'logo.' . $ext;
         $compDir = DATA_DIR . '/companies/' . $companyId;
+        // Luo kansio tarvittaessa (data on nyt MySQL:ssä, kansio vain logoille)
         if (!file_exists($compDir)) {
-            http_response_code(404);
-            echo json_encode(['error' => 'Yritystä ei löydy']);
-            break;
+            mkdir($compDir, 0755, true);
         }
-        // Poista vanha logo
+        // Poista vanha logo ja päivitä kantaan
         $companies = dbLoadCompanies();
+        $found = false;
         foreach ($companies as $comp) {
             if ($comp['id'] === $companyId) {
                 $oldLogo = $comp['logo_file'] ?? '';
@@ -735,9 +735,15 @@ switch ($action) {
                 }
                 $comp['logo_file'] = $newFilename;
                 dbSaveCompany($comp);
+                $found = true;
                 break;
             }
         }
+        if (!$found) {
+            http_response_code(404);
+            echo json_encode(['error' => 'Yritystä ei löydy']);
+            break;
+        }
         move_uploaded_file($file['tmp_name'], $compDir . '/' . $newFilename);
         echo json_encode([
             'success' => true,