Merge hotfix/wsdl-namespace-wrapper into master

Two root-cause bugs in the SOAP body template generator:

1. _parse_sequence flattened complex child elements (params.extend) instead
   of emitting a proper wrapper node, causing <request> to be skipped and its
   fields inlined directly into the operation element.

2. _build_schema_maps discarded each <xs:schema targetNamespace>, so all
   elements were stamped with the WSDL target namespace instead of the
   namespace of the schema block they were actually defined in.

Fix: introduce _Param tree nodes that carry an explicit per-element namespace,
track targetNamespace per schema block in elem_map/type_map, keep complex
children as container _Param nodes, and render the tree with correct prefixes
(tns: for target namespace, well-known short prefixes for DataContract etc.).

.gitignore

@@ -25,4 +25,3 @@ __pycache__/
 # Flatpak
 .flatpak/
 repo/
-*.local.json