fix: resolve 75 mem-cli compilation errors

All errors were API mismatches — handler code calling wrong method
   names, wrong argument types, or missing imports/derives. No logic
   changes. Build now passes with SQLX_OFFLINE=true.

   Key fixes:
   - embed_text -> embed_one, Vector -> Vec<f32> conversion
   - extract_token: extract auth header from HttpRequest first
   - AuthError variants aligned to actual enum definition
   - recursive async fns boxed (dfs_paths in inference + path_finder)
   - missing derives (Default, Serialize), imports (sqlx::Row, Timelike)
   - borrow-after-move: compute .len() before struct field move
   - streaming_body -> streaming with Result<Bytes> for SSE
   - CI: add SQLX_OFFLINE=true for offline builds without DB

   25 files changed, 99 insertions(+), 81 deletions(-)

Co-authored-by: rock <[email protected]>

crates/mem-cli/src/handlers/visualize_sse.rs

@@ -145,13 +145,15 @@ pub async fn visualize_stream_handler(
         match execute_streaming_visualization(&state, req_body).await {
             Ok(events) => {
                 for event in events {
-                    yield format_sse_event(event);
+                    let data = format_sse_event(event);
+                    yield Ok::<actix_web::web::Bytes, actix_web::Error>(actix_web::web::Bytes::from(data));
                 }
             }
             Err(e) => {
-                yield format_sse_event(VisualizeEvent::Error {
+                let data = format_sse_event(VisualizeEvent::Error {
                     message: e,
                 });
+                yield Ok::<actix_web::web::Bytes, actix_web::Error>(actix_web::web::Bytes::from(data));
             }
         }
     };
@@ -161,7 +163,7 @@ pub async fn visualize_stream_handler(
         .insert_header(("Cache-Control", "no-cache"))
         .insert_header(("Connection", "keep-alive"))
         .insert_header(("Transfer-Encoding", "chunked"))
-        .streaming_body(Box::pin(stream))
+        .streaming(Box::pin(stream))
 }
 
 /// Execute streaming visualization (generates events)