feat(docker): install mise in standalone image for language runtime

docker/start-backend.sh

@@ -15,8 +15,20 @@ echo "[backend-wrapper] BH_DB_NAME=${BH_DB_NAME:-}"
 echo "[backend-wrapper] BH_DB_PATH=${BH_DB_PATH:-}"
 echo "[backend-wrapper] config.ini exists=$([ -f /app/configs/config.ini ] && echo yes || echo no)"
 
-# 避免空目录挂载导致权限/路径问题
-mkdir -p /app/data /app/configs /app/envs /app/logs /app/data/scripts
+# 基础目录
+mkdir -p /app/data /app/configs /app/envs /app/logs /app/data/scripts /app/envs/mise
 
-# 直接前台运行，日志打到容器 stdout/stderr，方便 docker logs 排查
+# Mise 环境（挂载 ./envs 后仍可工作）
+export MISE_DATA_DIR="${MISE_DATA_DIR:-/app/envs/mise}"
+export MISE_CONFIG_DIR="${MISE_CONFIG_DIR:-/app/envs/mise}"
+export MISE_HIDE_UPDATE_WARNING=1
+export PATH="/app/envs/mise/shims:/app/envs/mise/bin:/usr/local/bin:$PATH"
+
+if command -v mise >/dev/null 2>&1; then
+  echo "[backend-wrapper] mise version: $(mise --version 2>/dev/null | head -n 1)"
+else
+  echo "[backend-wrapper] WARNING: mise not found in PATH"
+fi
+
+# 直接前台运行，日志打到容器 stdout/stderr
 exec /app/taskpool server