fix(go-models): route hosted OCR providers through drivers (#15233)

## Summary
- route hosted MinerU.Net and PaddleOCR.Net provider names to their
existing Go drivers
- add regression coverage for loading the hosted OCR provider configs
through ProviderManager

## What changed
- Added canonical provider-name aliases for the hosted OCR provider
display names.
- Covered both bundled configs with a focused provider-manager test.

## Why
The hosted provider configs use display names with `.Net`, while model
factory dispatch lowercases the provider name. Without aliases, those
configs fall through to `DummyModel` instead of using the existing
MinerU and PaddleOCR drivers.

---------

Co-authored-by: Jin Hai <haijin.chn@gmail.com>

internal/entity/models/factory.go

@@ -119,19 +119,19 @@ func (f *ModelFactory) CreateModelDriver(providerName string, baseURL map[string
 		return NewPPIOModel(baseURL, urlSuffix), nil
 	case "voyage":
 		return NewVoyageModel(baseURL, urlSuffix), nil
-	case "paddleocr":
+	case "paddleocr.net":
 		return NewPaddleOCRModel(baseURL, urlSuffix), nil
 	case "xunfei":
 		return NewXunFeiModel(baseURL, urlSuffix), nil
 	case "deepinfra":
 		return NewDeepInfraModel(baseURL, urlSuffix), nil
-	case "mineru":
+	case "mineru.net":
 		return NewMinerUModel(baseURL, urlSuffix), nil
 	case "jiekouai":
 		return NewJieKouAIModel(baseURL, urlSuffix), nil
 	case "302.ai":
 		return NewAI302Model(baseURL, urlSuffix), nil
-	case "mineru_local":
+	case "mineru":
 		return NewMinerLocalUModel(baseURL, urlSuffix), nil
 	case "futurmix":
 		return NewFuturMixModel(baseURL, urlSuffix), nil
@@ -143,7 +143,7 @@ func (f *ModelFactory) CreateModelDriver(providerName string, baseURL map[string
 		return NewN1NModel(baseURL, urlSuffix), nil
 	case "bedrock":
 		return NewBedrockModel(baseURL, urlSuffix), nil
-	case "paddleocr_local":
+	case "paddleocr":
 		return NewPaddleOCRLocalModel(baseURL, urlSuffix), nil
 	case "orcarouter":
 		return NewOrcaRouterModel(baseURL, urlSuffix), nil