fix: increase raw body limit to 4mb for CWMP XML payloads

GetParameterNamesResponse from CPEs with many parameters exceeds the
default 56kb raw body limit. Add a 'raw' section in bodyparser config
covering text/xml, application/xml and application/soap+xml with a 4mb
limit to handle large TR-069 discovery responses.

config/bodyparser.ts

@@ -73,6 +73,21 @@ const bodyParserConfig = defineConfig({
      */
     types: ['multipart/form-data'],
   },
+
+  /**
+   * Config for raw/text body parsing.
+   * CWMP/TR-069 uses text/xml. A GetParameterNamesResponse can easily
+   * exceed the default 56kb limit on devices with many parameters.
+   */
+  raw: {
+    limit: '4mb',
+    types: [
+      'text/xml',
+      'application/xml',
+      'application/soap+xml',
+      'text/plain',
+    ],
+  },
 })
 
 export default bodyParserConfig