Add socket timeout to is_port_in_use() to fix ~280s startup delay on WSL2 (#2077)

On WSL2 with networkingMode=mirrored, connect_ex() to non-listening ports
gets black-holed through the Windows host networking stack instead of
returning ECONNREFUSED. Without a timeout, TCP SYN retransmits with
exponential backoff (1+2+4+8+16+32+64 ≈ 127s per port), causing Router
Mode's port scan of 15001-15010 to stall for ~280 seconds on startup.

Adding a 1-second timeout makes connect_ex() fail fast, reducing startup
from ~303s to ~23s on affected systems.

Tested on WSL2 Ubuntu 24.04 with mirrored networking, KoboldCpp v1.110,
RTX 3090 Ti, Qwen3.5-27B Q4_K_M.

koboldcpp.py

@@ -2898,6 +2898,7 @@ def websearch(query):
 def is_port_in_use(portNum):
     try:
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            s.settimeout(1)
             return s.connect_ex(('localhost', portNum)) == 0
     except Exception:
         return True