Enhance Gitea support by improving base64 decoding and UTF-8 encoding handling

includes/push-client.php

@@ -104,7 +104,7 @@ function oribi_sync_api_request( string $method, string $url, array $body, strin
         'method'  => $method,
         'timeout' => 30,
         'headers' => $headers,
-        'body'    => wp_json_encode( $body, JSON_UNESCAPED_UNICODE ),
+        'body'    => wp_json_encode( $body, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES ),
     ];
 
     $response = wp_remote_request( $url, $args );
@@ -152,9 +152,15 @@ function oribi_sync_gitea_get_file_meta( string $api_base, string $branch, strin
         return $result;
     }
 
+    // Gitea inserts \n every 60 chars in base64 — strip before decoding.
+    $raw_b64 = $result['content'] ?? '';
+    $content = ! empty( $raw_b64 )
+        ? base64_decode( str_replace( [ "\r", "\n", " " ], '', $raw_b64 ), true )
+        : '';
+
     return [
         'sha'     => $result['sha'] ?? '',
-        'content' => isset( $result['content'] ) ? base64_decode( $result['content'] ) : '',
+        'content' => ( $content !== false ) ? $content : '',
     ];
 }
 
@@ -182,6 +188,11 @@ function oribi_sync_gitea_put_file(
     ?string $sha = null,
     string $message = ''
 ) {
+    // Validate and fix UTF-8 encoding before base64-encoding
+    if ( ! mb_check_encoding( $content, 'UTF-8' ) ) {
+        $content = mb_convert_encoding( $content, 'UTF-8', 'UTF-8, ISO-8859-1, Windows-1252' );
+    }
+    
     $encoded_path = implode( '/', array_map( 'rawurlencode', explode( '/', $filepath ) ) );
     $url = $api_base . '/contents/' . $encoded_path;