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/query/bfs_graph_traversal.rs

@@ -6,7 +6,7 @@
 use std::collections::{HashMap, VecDeque};
 use serde::{Deserialize, Serialize};
 use chrono::{DateTime, Utc};
-use sqlx::{Pool, Postgres};
+use sqlx::{Pool, Postgres, Row};
 
 /// A node in the traversal result
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -196,6 +196,7 @@ impl BfsGraphTraversal {
             });
         }
         
+        let edge_count = edges.len();
         Ok(GraphData {
             nodes,
             edges,
@@ -203,7 +204,7 @@ impl BfsGraphTraversal {
             requested_depth: config.max_depth,
             max_depth_reached: max_depth,
             node_count: visited.len(),
-            edge_count: edges.len(),
+            edge_count,
             depth_breakdown,
             traversal_time_ms: start_time.elapsed().as_millis() as u64,
         })