feat: Implement OpenRouter model discovery and endpoints

- Added OpenRouterModelDiscovery class for managing model listings and metadata resolution.
- Introduced OpenRouterModelEndpointsResponse and OpenRouterModelsResponse classes for handling API responses.
- Created OpenRouterModelQuery class to encapsulate query parameters for model listing.
- Updated ModelProfile to include OPENROUTER as a model provider.
- Enhanced ModelProfileService to handle default values for maxTokens and maxContextLength.
- Added OpenRouterClientTest for testing model discovery and chat completion functionalities.
- Configured application-test.properties and local-openrouter-chatcompletion.properties for OpenRouter integration.

src/test/resources/application-test.properties

@@ -7,6 +7,7 @@ profile.model.cold=local-chatcompletion
 profile.model.textcompletion=local-completion
 profile.model.chatcompletion=local-chatcompletion
 profile.model.ollama=local-ollama-chatcompletion
+profile.model.openrouter=local-openrouter-chatcompletion
 #profile.model.azure=llama3.3-70b-azure
 
 agent.threads=2

src/test/resources/local-openrouter-chatcompletion.properties

@@ -0,0 +1,16 @@
+category=OPENROUTER
+prompts=
+tokenizer=fallback
+tokenEncoding=cl100k_base
+maxTokens=2500
+maxContextLength=32768
+temperature=0.5
+topP=0.95
+modelProvider=OPENROUTER
+modelName=
+url=
+apiKey=${OPENROUTER_API_KEY:}
+cost1MInTokens=0
+cost1MCachedInTokens=0
+cost1MOutTokens=0
+cost1MReasoningOutTokens=0