feat: add stream parameter support for item content responses

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

src/modes/server/common.rs

@@ -128,6 +128,8 @@ pub struct ItemQuery {
     pub offset: u64,
     #[serde(default)]
     pub length: u64,
+    #[serde(default = "default_stream")]
+    pub stream: bool,
 }
 
 #[derive(Debug, Deserialize, utoipa::ToSchema)]
@@ -139,6 +141,8 @@ pub struct ItemContentQuery {
     pub offset: u64,
     #[serde(default)]
     pub length: u64,
+    #[serde(default = "default_stream")]
+    pub stream: bool,
 }
 
 fn check_bearer_auth(auth_str: &str, expected_password: &str, expected_hash: &Option<String>) -> bool {