[BUG][JAVA] Direct property enum reference used by parameter omits generated model import

[mricken]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The Java client generator produces uncompilable code when a query parameter schema directly references an inline enum property of a component schema.

The generator promotes the inline enum to a model enum (StockState), but the generated API class uses that type without importing it.

Actual result

The generator creates:

src/main/java/org/openapitools/client/model/StockState.java

but generates DefaultApi.java with unqualified uses of StockState:

public okhttp3.Call listArchivesCall(
    @javax.annotation.Nullable StockState state,
    final ApiCallback _callback) throws ApiException {

DefaultApi.java does not contain:

import org.openapitools.client.model.StockState;

Compilation fails five times with:

error: cannot find symbol
  symbol:   class StockState
  location: class DefaultApi

Expected result

The generated Java client should compile. DefaultApi.java should import StockState, or use its fully qualified name.

openapi-generator version

7.26.0-SNAPSHOT, built from current master commit b391b2b98c5926ee9842ef3bc863b57c4d824bbe.

Also happens in 7.24.0.

This has not been bisected to identify the first affected version.

OpenAPI declaration file content or url

openapi: 3.1.0
info:
  title: Enum parameter import
  version: 1.0.0
paths:
  /archives:
    get:
      operationId: listArchives
      parameters:
        - name: state
          in: query
          required: false
          schema:
            $ref: "#/components/schemas/Archive/properties/state"
      responses:
        "200":
          description: Success
components:
  schemas:
    Archive:
      type: object
      properties:
        state:
          type: string
          enum:
            - ACTIVE

Generation Details

java -jar openapi-generator-cli.jar generate \
  -g java \
  -i enum-not-imported.yaml \
  -o generated \
  --skip-validate-spec \
  --additional-properties modelNamePrefix=Stock,hideGenerationTimestamp=true

Steps to reproduce

1. Save the OpenAPI declaration above as enum-not-imported.yaml.

2. Validate it:

   java -jar openapi-generator-cli.jar validate -i enum-not-imported.yaml

3. Generate the Java client with the command above.

4. Compile the generated client:

   cd generated
   mvn -q -DskipTests compile

Related issues/PRs

• did not find any

Suggest a fix

DefaultCodegen#fromParameter handles imports specially for array parameter items, but the direct scalar enum reference in this reproducer is not added to the API operation's import set.

When a parameter's resolved schema produces a generated enum model type, add that type to the operation imports so the Java API template emits:

import org.openapitools.client.model.StockState;