[scala][http4s] fix codegen for using reserved words in openapi

[donilg]

There is an example of correct openAPI specification:

{
  "openapi": "3.0.0",
  "info": {
    "title": "Simple API",
    "description": "A simple API with GET and POST endpoints",
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "https://api.example.com/v1"
    }
  ],
  "paths": {
    "/users": {
      "get": {
        "summary": "Method with non-escaped parameter and escaped parameter",
        "parameters": [
          {
            "name": "id",
            "in": "query",
            "description": "Non-escaped parameter that should not be modified",
            "required": true,
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          },
          {
            "name": "type",
            "in": "query",
            "description": "Escaped parameter that should be modified",
            "required": true,
            "schema": {
              "type": "string",
              "enum": [
                "active",
                "inactive",
                "pending"
              ]
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Successful response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/User"
                }
              }
            }
          }
        }
      }
    },
    "/users/{type}/{var}/{id}": {
      "get": {
        "summary": "Method with non-escaped parameter, escaped string parameter and escaped long parameter",
        "parameters": [
          {
            "name": "type",
            "in": "path",
            "required": true,
            "description": "Escaped string parameter that should be modified",
            "schema": {
              "type": "string",
              "enum": [
                "active",
                "inactive",
                "pending"
              ]
            }
          },
          {
            "name": "var",
            "in": "path",
            "required": true,
            "description": "Escaped long parameter that should be modified",
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          },
          {
            "name": "id",
            "in": "path",
            "required": true,
            "description": "Non-escaped parameter that should not be modified",
            "schema": {
              "type": "integer",
              "format": "int64"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Successful response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/User"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "User": {
        "type": "object",
        "properties": {
          "result": {
            "type": "string",
            "enum": [
              "active",
              "inactive",
              "pending"
            ]
          }
        },
        "required": [
          "result"
        ]
      }
    }
  }
}

For given OpenAPI specification generated not compiled code because it uses reserved words.
I changed baseName to paramName to use escaped variables instead of reserved words for scala-http4s-server

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  ./mvnw clean package || exit
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Hello! 👋
I'd love to get your eyes on this PR when you have a moment.
Thanks in advance!

@clasnake (2017/07), @shijinkui (2018/01), @ramzimaalej (2018/03), @chameleon82 (2020/03), @Bouillie (2020/04) @Fish86 (2023/06)

[wing328]

thanks for the pr

tested locally to confirm the fix works as expected

$ sbt compile
[info] welcome to sbt 1.10.11 (Eclipse Adoptium Java 17.0.10)
[info] loading settings for project global-plugins from gpg.sbt...
[info] loading global plugins from C:\Users\wing3\.sbt\1.0\plugins
[info] loading project definition from C:\Users\wing3\AppData\Local\Temp\ajson\project
[info] loading settings for project ajson from build.sbt...
[info] set current project to ajson (in build file:/C:/Users/wing3/AppData/Local/Temp/ajson/)
[info] Executing in batch mode. For better performance use sbt's shell
[info] compiling 5 Scala sources to C:\Users\wing3\AppData\Local\Temp\ajson\target\scala-2.13\classes ...
[info] done compiling
[success] Total time: 11 s, completed Jul 2, 2025, 3:28:33 PM

[wing328]

FYI. Merged #21507 to add tests covering reserved words moving forward