log ace-server restart, show output for adapter debugging

app.py

@@ -246,6 +246,7 @@ _ace_proc = None
 def _stop_ace_server():
     """Stop ace-server process."""
     global _ace_proc
+    logger.info("[ace-server] Stopping...")
     if _ace_proc and _ace_proc.poll() is None:
         _ace_proc.terminate()
         try:
@@ -253,11 +254,13 @@ def _stop_ace_server():
         except subprocess.TimeoutExpired:
             _ace_proc.kill()
         _ace_proc = None
+        logger.info("[ace-server] Stopped (tracked PID)")
     else:
         try:
             subprocess.run(["pkill", "ace-server"],
                            stderr=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
                            timeout=10)
+            logger.info("[ace-server] Stopped (pkill)")
         except Exception:
             pass
     time.sleep(1)
@@ -266,20 +269,22 @@ def _stop_ace_server():
 def _start_ace_server():
     """Start ace-server in background and wait for health."""
     global _ace_proc
+    logger.info("[ace-server] Starting with --adapters %s", ADAPTER_DIR)
     try:
         _ace_proc = subprocess.Popen(
             [ACE_SERVER_BIN, "--host", "127.0.0.1", "--port", "8085",
              "--models", MODELS_DIR, "--adapters", ADAPTER_DIR, "--max-batch", "1"],
-            stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
         )
     except Exception as exc:
-        logger.error("Failed to start ace-server: %s", exc)
+        logger.error("[ace-server] Failed to start: %s", exc)
         return False
 
     for _ in range(30):
         if _server_ok():
+            logger.info("[ace-server] Healthy")
             return True
         time.sleep(2)
+    logger.error("[ace-server] Health check timeout")
     return False