feat(api): add OpenAPI schema postprocessing hooks for Mintlify compatibility

Add three postprocessing hooks to fix OpenAPI 3.0.x compatibility issues
generated by drf-spectacular-jsonapi:

1. fix_empty_id_fields: Fixes empty id field definitions ({}) in JSON:API
   request schemas (particularly PATCH/update requests) by replacing them
   with proper schema: {"type": "string", "format": "uuid", "description": "..."}

2. fix_pattern_properties: Converts patternProperties to additionalProperties
   for OpenAPI 3.0 compatibility. patternProperties is only available in
   OpenAPI 3.1+, but drf-spectacular generates 3.0.3 specs. This is needed
   for the Prowler mutelist configuration which uses dynamic keys.

3. fix_type_formats: Fixes invalid type values like "email" that
   drf-spectacular generates from Django's EmailField. Converts them to
   proper OpenAPI format: "type": "string" with "format": "email".
   Also handles "url" → "uri" and "uuid" formats.

These hooks ensure the generated OpenAPI schema validates correctly with
Mintlify and other OpenAPI 3.0.x tools.

docs/docs.json

@@ -329,6 +329,10 @@
       {
         "tab": "Public Roadmap",
         "href": "https://roadmap.prowler.com/"
+      },
+      {
+        "tab": "API Reference",
+        "openapi": "api-reference/openapi.json"
       }
     ],
     "global": {