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/agent/client_sdk.rs

@@ -227,7 +227,7 @@ impl SynthesisClient {
     ) -> Vec<Result<ClientResponse, String>> {
         let mut results = Vec::new();
         for req in requests {
-            results.push(self.execute(&req).await);
+            results.push(self.execute(req).await);
         }
         results
     }
@@ -280,11 +280,12 @@ impl SynthesisClient {
             tracing::debug!("Workflow executed in {}ms", elapsed_ms);
             Ok(body)
         } else {
+            let status = response.status();
             let error_text = response
                 .text()
                 .await
                 .unwrap_or_else(|_| "unknown error".to_string());
-            Err(format!("Workflow failed ({}): {}", response.status(), error_text))
+            Err(format!("Workflow failed ({}): {}", status, error_text))
         }
     }
 }