feat: backup type filter + path traversal protection (#68, #72)

#68: Add backup type filter dropdown to backups list view
- filter_backups.xml: full/database/files/differential options
- BackupsModel: backup_type filter in getListQuery()
- Language string: COM_MOKOJOOMBACKUP_FILTER_TYPE_ALL

#72: Path traversal protection in RestoreEngine and MokoRestore
- RestoreEngine::extractArchive(): validate ZIP entries before extractTo()
- RestoreEngine::extractTarGz(): validate PharData entries before extractTo()
- MokoRestore standalone script: same validation in generated PHP code
- Rejects entries containing ../ or starting with / or \

Closes #68, closes #72

source/packages/com_mokosuitebackup/forms/filter_backups.xml

@@ -19,6 +19,18 @@
 			<option value="fail">COM_MOKOJOOMBACKUP_STATUS_FAIL</option>
 			<option value="pending">COM_MOKOJOOMBACKUP_STATUS_PENDING</option>
 		</field>
+		<field
+			name="backup_type"
+			type="list"
+			label="COM_MOKOJOOMBACKUP_FIELD_BACKUP_TYPE"
+			onchange="this.form.submit();"
+		>
+			<option value="">COM_MOKOJOOMBACKUP_FILTER_TYPE_ALL</option>
+			<option value="full">COM_MOKOJOOMBACKUP_TYPE_FULL</option>
+			<option value="database">COM_MOKOJOOMBACKUP_TYPE_DATABASE</option>
+			<option value="files">COM_MOKOJOOMBACKUP_TYPE_FILES</option>
+			<option value="differential">COM_MOKOJOOMBACKUP_TYPE_DIFFERENTIAL</option>
+		</field>
 	</fields>
 
 	<fields name="list">

source/packages/com_mokosuitebackup/language/en-GB/com_mokosuitebackup.ini

@@ -167,6 +167,7 @@ COM_MOKOJOOMBACKUP_STATUS_PENDING="Pending"
 COM_MOKOJOOMBACKUP_FILTER_SEARCH="Search"
 COM_MOKOJOOMBACKUP_FILTER_STATUS="Status"
 COM_MOKOJOOMBACKUP_FILTER_STATUS_ALL="- Select Status -"
+COM_MOKOJOOMBACKUP_FILTER_TYPE_ALL="- Select Type -"
 
 ; Tabs and fieldsets
 COM_MOKOJOOMBACKUP_TAB_GENERAL="General"

source/packages/com_mokosuitebackup/src/Engine/MokoRestore.php

@@ -303,6 +303,20 @@ function actionExtract(array $data): array
         $zip->setPassword($password);
     }
 
+    // Validate all entries before extraction (path traversal protection)
+    for ($i = 0; $i < $zip->numFiles; $i++) {
+        $entryName = $zip->getNameIndex($i);
+
+        if ($entryName === false) {
+            continue;
+        }
+
+        if (str_contains($entryName, '../') || str_contains($entryName, '..\\') || str_starts_with($entryName, '/') || str_starts_with($entryName, '\\')) {
+            $zip->close();
+            throw new RuntimeException('Archive contains unsafe path: ' . $entryName);
+        }
+    }
+
     if (!$zip->extractTo(RESTORE_DIR)) {
         $zip->close();
         throw new RuntimeException(

source/packages/com_mokosuitebackup/src/Engine/RestoreEngine.php

@@ -191,6 +191,20 @@ class RestoreEngine
 			$this->log('Decryption password set');
 		}
 
+		// Validate all entries before extraction (path traversal protection)
+		for ($i = 0; $i < $zip->numFiles; $i++) {
+			$entryName = $zip->getNameIndex($i);
+
+			if ($entryName === false) {
+				continue;
+			}
+
+			if (str_contains($entryName, '../') || str_contains($entryName, '..\\') || str_starts_with($entryName, '/') || str_starts_with($entryName, '\\')) {
+				$zip->close();
+				throw new \RuntimeException('Archive contains unsafe path: ' . $entryName);
+			}
+		}
+
 		if (!$zip->extractTo($this->stagingDir)) {
 			$zip->close();
 
@@ -210,6 +224,18 @@ class RestoreEngine
 	private function extractTarGz(string $archivePath): void
 	{
 		$phar = new \PharData($archivePath);
+
+		// Validate all entries before extraction (path traversal protection)
+		foreach (new \RecursiveIteratorIterator($phar) as $entry) {
+			$entryName = $entry->getPathname();
+			// PharData paths are prefixed with phar:// — extract the relative part
+			$relative = substr($entryName, strlen('phar://' . $archivePath) + 1);
+
+			if (str_contains($relative, '../') || str_contains($relative, '..\\') || str_starts_with($relative, '/') || str_starts_with($relative, '\\')) {
+				throw new \RuntimeException('Archive contains unsafe path: ' . $relative);
+			}
+		}
+
 		$phar->extractTo($this->stagingDir, null, true);
 		$this->log('Extracted tar.gz archive');
 	}

source/packages/com_mokosuitebackup/src/Model/BackupsModel.php

@@ -61,6 +61,13 @@ class BackupsModel extends ListModel
 			$query->where($db->quoteName('a.profile_id') . ' = ' . (int) $profileId);
 		}
 
+		// Filter by backup type
+		$backupType = $this->getState('filter.backup_type');
+
+		if (!empty($backupType)) {
+			$query->where($db->quoteName('a.backup_type') . ' = ' . $db->quote($backupType));
+		}
+
 		// Filter by search
 		$search = $this->getState('filter.search');