feat: add default_stream function with false return value

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/modes/server/common.rs

@@ -161,6 +161,10 @@ fn default_allow_binary() -> bool {
     true
 }
 
+fn default_stream() -> bool {
+    false
+}
+
 fn check_basic_auth(auth_str: &str, expected_password: &str, expected_hash: &Option<String>) -> bool {
     if !auth_str.starts_with("Basic ") {
         return false;