Fix/mcp tools deserialization (#64)

* fix: use native SSL on macOS/Windows, remove OpenSSL dependency

- macOS: Use SecureTransport (via Security framework)
- Windows: Use WinSSL/Schannel (via crypt32)
- Remove OpenSSL requirement for faster compilation
- Smaller binaries and better OS security integration

* fix: properly deserialize MCP tools from extensions in ResponsesRequest

- Fix tools being cleared but not re-added from extensions
- Convert JSON tools array to ToolVariant vector correctly
- Properly deserialize McpTool from JSON in ResponsesRequest::fromLLMRequest

This ensures MCP tools are properly included in API requests to OpenAI

Author: lucaromagnoli

src/openai/OpenAITypes.cpp

@@ -71,10 +71,18 @@ ResponsesRequest ResponsesRequest::fromLLMRequest(const LLMRequest& request) {
     // Handle tools from extensions (if present)
     if (hasTools(request.config)) {
         json toolsJson = getToolsJson(request.config);
-        // Tools are stored as JSON - we need to deserialize them into ToolVariant
-        // For now, we'll parse them on a best-effort basis
-        // TODO: Implement proper tool deserialization
-        responsesReq.tools.clear();  // Clear any existing tools
+        responsesReq.tools.clear();
+
+        // Convert JSON tools array to ToolVariant vector
+        for (const auto& toolJson : toolsJson) {
+            if (toolJson.contains("type")) {
+                std::string toolType = toolJson["type"].get<std::string>();
+                if (toolType == "mcp") {
+                    McpTool mcpTool = McpTool::fromJson(toolJson);
+                    responsesReq.tools.push_back(mcpTool);
+                }
+            }
+        }
     }
 
     // Handle JSON schema for structured outputs