CAMEL-23390: Add audio transcription support to camel-openai

[Croway]

Summary

• Add a new audio-transcription operation to the camel-openai component that transcribes audio files using OpenAI's speech-to-text models (Whisper, GPT-4o Transcribe)
• Support File, Path, InputStream, and byte[] as input body types
• Expose key parameters as endpoint options and headers: audioModel, audioLanguage, audioPrompt, audioResponseFormat, audioTemperature, audioTimestampGranularities
• Extend mock test infrastructure (OpenAIMock, OpenAIMockBuilder, OpenAIMockServerHandler) to support audio transcription expectations
• Include 6 mock tests covering all input types, header overrides, and missing model validation

Jira: https://issues.apache.org/jira/browse/CAMEL-23390

Test plan

• 6 mock tests pass (OpenAIAudioTranscriptionMockTest)
• All 60 existing tests pass (no regressions)
• Verified against a local MLX Audio server with Granite Speech model
• CI green

Claude Code on behalf of Federico Mariani

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• catalog/camel-catalog
• components/camel-ai/camel-openai
• dsl/camel-componentdsl
• dsl/camel-endpointdsl
• test-infra/camel-test-infra-openai-mock

⚠️ Some tests are disabled on GitHub Actions (@DisabledIfSystemProperty(named = "ci.env.name")) and require manual verification:

• components/camel-ai/camel-openai: 6 test(s) disabled on GitHub Actions

All tested modules (15 modules)

• Camel :: AI :: LangChain4j :: Agent
• Camel :: AI :: LangChain4j :: Tools
• Camel :: AI :: OpenAI
• Camel :: Catalog :: Camel Catalog
• Camel :: Component DSL
• Camel :: Endpoint DSL
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container
• Camel :: Test Infra :: All test services
• Camel :: Test Infra :: OpenAI Mock
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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