feat(server): add /api/version endpoint exposing git hash

server/src/main.rs

@@ -243,6 +243,12 @@ fn run_server(state: Arc<MemoryState>) -> Result<(), Box<dyn std::error::Error>>
         });
 
         let app = Router::new()
+            .route("/api/version", get(|| async move {
+                axum::Json(serde_json::json!({
+                    "version": env!("CARGO_PKG_VERSION"),
+                    "git_hash": option_env!("GIT_HASH").unwrap_or("unknown")
+                }))
+            }))
             .route("/sse", get(sse_handler))
             .route("/messages", post(message_handler))
             .route("/health", get(health_handler))