fix(api): /fx-gui/close dong TAT CA bridge trung plugin (khong chi proc dau)

app/api/v1/plugins.py

@@ -793,6 +793,7 @@ async def close_fx_gui(req: FxGuiCloseRequest, current_user: dict = Depends(get_
     plugin_path = (req.path or "").strip()
     if not plugin_path:
         raise HTTPException(status_code=400, detail="Thiếu đường dẫn VST plugin.")
+    found = False
     for proc in _FX_GUI_PROCESSES:
         if proc is not None and proc.poll() is None and getattr(proc, "_sf_plugin_path", None) == plugin_path:
             proc.terminate()
@@ -800,9 +801,9 @@ async def close_fx_gui(req: FxGuiCloseRequest, current_user: dict = Depends(get_
                 proc.wait(timeout=5)
             except Exception:
                 proc.kill()
-            _prune_fx_gui_processes()
-            return {"success": True, "closed": True}
-    return {"success": True, "closed": False}
+            found = True
+    _prune_fx_gui_processes()
+    return {"success": True, "closed": found}
 
 
 _FX_GUI_PROCESSES = []  # list[subprocess.Popen] — các bridge fx-gui do app spawn