[goose-llm] use chrono utc timestamp milliseconds for msg created (#2483)

crates/goose-llm/src/message.rs

@@ -286,7 +286,7 @@ impl Message {
     pub fn new(role: Role) -> Self {
         Self {
             role,
-            created: Utc::now().timestamp(),
+            created: Utc::now().timestamp_millis(),
             content: Contents::default(),
         }
     }

crates/goose-llm/src/providers/formats/databricks.rs

@@ -324,7 +324,7 @@ pub fn response_to_message(response: Value) -> anyhow::Result<Message> {
 
     Ok(Message {
         role: Role::Assistant,
-        created: chrono::Utc::now().timestamp(),
+        created: chrono::Utc::now().timestamp_millis(),
         content: content.into(),
     })
 }

crates/goose-llm/src/providers/formats/openai.rs

@@ -234,7 +234,7 @@ pub fn response_to_message(response: Value) -> anyhow::Result<Message> {
 
     Ok(Message {
         role: Role::Assistant,
-        created: chrono::Utc::now().timestamp(),
+        created: chrono::Utc::now().timestamp_millis(),
         content: content.into(),
     })
 }