chore: remove unused imports and variables

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

src/modes/server/common.rs

@@ -108,12 +108,6 @@ pub struct ItemContentInfo {
 #[derive(Debug, Deserialize)]
 pub struct TagsQuery {
     pub tags: Option<String>,
-    #[serde(default = "default_allow_binary")]
-    pub allow_binary: bool,
-}
-
-fn default_allow_binary() -> bool {
-    true
 }
 
 #[derive(Debug, Deserialize)]
@@ -208,11 +202,6 @@ pub async fn logging_middleware(
 ) -> Response {
     let method = request.method().clone();
     let uri = request.uri().clone();
-    let request_content_length = request.headers()
-        .get("content-length")
-        .and_then(|v| v.to_str().ok())
-        .and_then(|s| s.parse::<u64>().ok())
-        .unwrap_or(0);
     
     let start = Instant::now();
     let response = next.run(request).await;