fix(vikon): skip existing files during FM sync, match original PHP diff behavior

Original vikon_core sync_root_dir.php only downloads files that are
missing locally or have size 0. Added local file size check before
downloading to avoid re-fetching 14GB+ of existing files.

app/Containers/VikonIntegration/Actions/SyncFilesAction.php

@@ -72,12 +72,23 @@ class SyncFilesAction
         $files = $response->json()['files'] ?? [];
         if (empty($files)) return 0;
 
+        $existingFiles = [];
+        if (File::isDirectory($filesDir)) {
+            foreach (File::files($filesDir) as $f) {
+                $existingFiles[$f->getFilename()] = $f->getSize();
+            }
+        }
+
         $synced = 0;
         foreach ($files as $file) {
             $name = $file['n'] ?? null;
             $identity = $file['i'] ?? null;
             if (!$name || !$identity) continue;
 
+            if (isset($existingFiles[$name]) && $existingFiles[$name] > 0) {
+                continue;
+            }
+
             try {
                 $content = $this->http->downloadWithToken(
                     "sync/downloadFileBinaryForSync?identity={$identity}&moduleId={$moduleId}",
@@ -107,12 +118,21 @@ class SyncFilesAction
         $targetDir = $filesDir . '/' . $dirId;
         File::makeDirectory($targetDir, 0755, true, true);
 
+        $existingFiles = [];
+        foreach (File::files($targetDir) as $f) {
+            $existingFiles[$f->getFilename()] = $f->getSize();
+        }
+
         $synced = 0;
         foreach ($files as $file) {
             $name = $file['n'] ?? null;
             $identity = $file['i'] ?? null;
             if (!$name || !$identity) continue;
 
+            if (isset($existingFiles[$name]) && $existingFiles[$name] > 0) {
+                continue;
+            }
+
             try {
                 $content = $this->http->downloadWithToken(
                     "sync/downloadFileBinaryForSync?identity={$identity}&moduleId={$moduleId}",

app/Containers/VikonIntegration/Actions/UpdateCoreAction.php

@@ -100,12 +100,23 @@ class UpdateCoreAction
         $files = $response->json()['files'] ?? [];
         if (empty($files)) return 0;
 
+        $existingFiles = [];
+        if (File::isDirectory($filesDir)) {
+            foreach (File::files($filesDir) as $f) {
+                $existingFiles[$f->getFilename()] = $f->getSize();
+            }
+        }
+
         $synced = 0;
         foreach ($files as $file) {
             $name = $file['n'] ?? null;
             $identity = $file['i'] ?? null;
             if (!$name || !$identity) continue;
 
+            if (isset($existingFiles[$name]) && $existingFiles[$name] > 0) {
+                continue;
+            }
+
             try {
                 $content = $this->http->downloadWithToken(
                     "sync/downloadFileBinaryForSync?identity={$identity}&moduleId={$moduleId}",
@@ -135,12 +146,21 @@ class UpdateCoreAction
         $targetDir = $filesDir . '/' . $dirId;
         File::makeDirectory($targetDir, 0755, true, true);
 
+        $existingFiles = [];
+        foreach (File::files($targetDir) as $f) {
+            $existingFiles[$f->getFilename()] = $f->getSize();
+        }
+
         $synced = 0;
         foreach ($files as $file) {
             $name = $file['n'] ?? null;
             $identity = $file['i'] ?? null;
             if (!$name || !$identity) continue;
 
+            if (isset($existingFiles[$name]) && $existingFiles[$name] > 0) {
+                continue;
+            }
+
             try {
                 $content = $this->http->downloadWithToken(
                     "sync/downloadFileBinaryForSync?identity={$identity}&moduleId={$moduleId}",