various fix

backend/app/algo_host/subprocess_runner.py

@@ -11,6 +11,7 @@ from pathlib import Path
 from loguru import logger
 
 from app.algo_host.bundle import load_reference_default_config, resolve_bundle_relative_path
+from app.algo_host.cjk_font import resolve_cjk_font_path
 from app.algo_host.transcode import VISUALIZATION_MAX_WIDTH
 
 
@@ -46,7 +47,7 @@ def build_visualization_command(
     device_cfg = cfg.get("device") if isinstance(cfg.get("device"), dict) else {}
     hand_raw = str((weights or {}).get("hand") or "weights/hand_detect.pt").strip()
     hand_model = resolve_bundle_relative_path(bundle_dir, hand_raw)
-    return [
+    cmd = [
         sys.executable,
         "-X",
         "faulthandler",
@@ -64,6 +65,10 @@ def build_visualization_command(
         "--max-width",
         str(VISUALIZATION_MAX_WIDTH),
     ]
+    font_path = resolve_cjk_font_path()
+    if font_path is not None:
+        cmd.extend(["--font-path", str(font_path)])
+    return cmd
 
 
 def _signal_name(signum: int) -> str: