fix:openapi

[redoom]

Summary

Fix two critical issues in Dubbo REST OpenAPI schema resolution for generic nested types:

1. Generic nested type resolution incomplete - Schemas for intermediate generic types (e.g., PageResponse in ApiResponse<PageResponse<AccessLogRes>>) were completely missing

2. Annotated fields disappearing or losing annotation metadata - Fields with @Schema annotations were filtered out, and description/example properties were not displayed

Before Fix

{
  "AccessLogRes": {
    "properties": {
      "userId": { "type": "string" },
      "createTime": { "format": "date-time", "type": "string" }
    }
  }
}

Missing id and action fields No description or example in any field

---

After Fix

{
  "AccessLogRes": {
    "properties": {
      "id": {
        "type": "string",
        "description": "操作ID",
        "example": "123456"
      },
      "userId": { "type": "string" },
      "action": {
        "type": "string",
        "description": "操作类型",
        "example": "LOGIN"
      },
      "createTime": { "format": "date-time", "type": "string" }
    }
  }
}

All 4 fields present Annotation metadata (description, example) properly displayed

---

Related Issues

https://github.com/apache/dubbo/issues/15718

[codecov-commenter]

Codecov Report

:x: Patch coverage is 0% with 79 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 60.70%. Comparing base (47a141c) to head (7648a7e).

Files with missing lines	Patch %	Lines
.../rpc/protocol/tri/rest/openapi/SchemaResolver.java	0.00%	77 Missing :warning:
.../support/basic/BasicOpenAPIDefinitionResolver.java	0.00%	1 Missing :warning:
...port/swagger/SwaggerOpenAPIDefinitionResolver.java	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15806      +/-   ##
============================================
- Coverage     60.75%   60.70%   -0.05%     
- Complexity    11703    11706       +3     
============================================
  Files          1938     1938              
  Lines         88694    88767      +73     
  Branches      13387    13404      +17     
============================================
  Hits          53886    53886              
- Misses        29275    29355      +80     
+ Partials       5533     5526       -7     

Flag	Coverage Δ
integration-tests-java21	32.35% <0.00%> (+0.02%)	:arrow_up:
integration-tests-java8	32.36% <0.00%> (-0.17%)	:arrow_down:
samples-tests-java21	31.98% <0.00%> (-0.12%)	:arrow_down:
samples-tests-java8	29.69% <0.00%> (+0.07%)	:arrow_up:
unit-tests-java11	59.01% <0.00%> (-0.04%)	:arrow_down:
unit-tests-java17	58.49% <0.00%> (-0.05%)	:arrow_down:
unit-tests-java21	58.47% <0.00%> (-0.07%)	:arrow_down:
unit-tests-java25	58.44% <0.00%> (-0.06%)	:arrow_down:
unit-tests-java8	58.99% <0.00%> (-0.05%)	:arrow_down:

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[RainYuY]

@heliang666s PTAL