Fix HTML generator to display array types for body parameters

The HTML generator (htmlDocs) was not properly displaying array types
for request body parameters. When an endpoint accepted an array of
objects as input, only the base type was shown (e.g., "User") instead
of the full array type (e.g., "array[User]").

This fix updates the bodyParam.mustache template to include container
type information (array, map, etc.) when present, matching the format
already used for return types.

Before: User
After: array[User]

The fix wraps the baseType with containerType[...] when isContainer
is true, ensuring consistent type display across both input and output
types in the generated HTML documentation.

Author: claude

modules/openapi-generator/src/main/resources/htmlDocs/bodyParam.mustache

@@ -1,3 +1,3 @@
-{{#isBodyParam}}<div class="param">{{baseName}} {{#baseType}}<a href="#{{baseType}}">{{baseType}}</a>{{/baseType}} {{^required}}(optional){{/required}}{{#required}}(required){{/required}}</div>
+{{#isBodyParam}}<div class="param">{{baseName}} {{#isContainer}}{{containerType}}[{{/isContainer}}{{#baseType}}<a href="#{{baseType}}">{{baseType}}</a>{{/baseType}}{{#isContainer}}]{{/isContainer}} {{^required}}(optional){{/required}}{{#required}}(required){{/required}}</div>
 
       <div class="param-desc"><span class="param-type">Body Parameter</span> &mdash; {{unescapedDescription}} {{#defaultValue}}default: {{{.}}}{{/defaultValue}}</div>{{/isBodyParam}}