fix: use Clash API only for traffic stats on stock sing-box builds

Official sing-box binaries lack v2ray_api, so drop that config and grpcio
and track per-node traffic from Clash connection stats instead.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/render-server.py

@@ -58,7 +58,6 @@ def build_config(env: dict[str, str], nodes: list[dict]) -> dict:
     hy2_users = [
         {"name": n["uuid"], "password": n["hy2_password"]} for n in nodes
     ]
-    user_ids = [n["uuid"] for n in nodes]
     clash_secret = env.get("CLASH_API_SECRET", "")
 
     config = {
@@ -109,14 +108,6 @@ def build_config(env: dict[str, str], nodes: list[dict]) -> dict:
         "clash_api": {
             "external_controller": "127.0.0.1:9090",
         },
-        "v2ray_api": {
-            "listen": "127.0.0.1:9091",
-            "stats": {
-                "enabled": True,
-                "inbounds": ["vless-reality-in", "hysteria2-in"],
-                "users": user_ids,
-            },
-        },
     }
     if clash_secret:
         experimental["clash_api"]["secret"] = clash_secret