feat(p800): auto-load timing module in every TP worker process

sitecustomize.py is imported automatically by Python at startup
in every process, including the SGLang scheduler/TP worker
processes spawned for tensor parallelism. Adding the p800_timing
import here ensures the monkey-patches are applied to all 8 TP
workers, not just the launch_server parent process (which never
runs the model forward and would record empty timing data).

The timing module self-disables unless SGLANG_TIMING_ENABLED=1,
so this import is a no-op when timing is not in use.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

platforms/patches/kunlun_p800/sitecustomize_xpu.py

@@ -5,3 +5,6 @@ import torch
 # them on P800 via its own FP8 kernels.
 if not hasattr(torch, "float8_e8m0fnu"):
     torch.float8_e8m0fnu = torch.uint8
+
+# P800 Timing module
+import p800_timing