Responses input improvements

Author: Recouse

Sources/OpenAI/Common/Content.swift

@@ -7,7 +7,7 @@
 
 public enum Content: Encodable, Sendable {
     case text(String)
-    case content(InputContent)
+    case content([InputContent])
 
     public func encode(to encoder: any Encoder) throws {
         var container = encoder.singleValueContainer()

Sources/OpenAI/Responses/ResponsesBody.swift

@@ -144,9 +144,9 @@ public extension Responses {
 
             /// Text, image, or audio input to the model, used to generate a response. Can also contain
             /// previous assistant responses.
-            public let content: [Content]
+            public let content: Content
 
-            public init(role: Role, content: [Content]) {
+            public init(role: Role, content: Content) {
                 self.role = role
                 self.content = content
             }