When Route Path Contains No Placeholders, Path Parameters Declared in Request Are Still Generated (Resulting in Invalid Swagger)

Phenomenon

If a request struct declares path:"id", but the route path has no /:id (or {id}) placeholder, goctl still generates parameters with in: path, name: id in the swagger.

This creates swagger/OpenAPI semantic inconsistency: path parameters must appear in the URL template.

Minimal Reproduction

extra_path_param.api:

syntax = "v1"

info(
  title: "t"
  desc: "t"
  author: "t"
  email: "t"
)

type Req {
  ID string `path:"id"`
}

@server(
  prefix: /api/test
  group: test
)
service t {
  @handler H
  get /foo (Req) returns ()
}

Run:

goctl api swagger --api extra_path_param.api --dir . --filename extra_path_param

Actual Result (Key Swagger Snippet)

[
  {
    "type": "string",
    "name": "id",
    "in": "path",
    "required": true
  }
]

However, the corresponding path is /api/test/foo, which does not contain {id}.

Expected Result

• goctl should validate: only generate path parameters when the route path contains corresponding placeholders.
• Or at minimum print a warning / fail generation and prompt users to fix the .api file.

Possible Fix Directions (For PR Reference)

• When generating path parameters, the swagger generator should parse the route path (e.g., /foo) to extract the set of placeholders (id, namespace, etc.), and only keep matching path:"..." fields.
• If request declares extra path parameters, suggest warning (and optionally error in strict mode).