fix(vps-xray): update_env_field 追加时处理缺尾换行的文件，防止字段黏连

vps-xray/deploy.sh

@@ -139,6 +139,10 @@ update_env_field() {
         esc=$(printf '%s' "$value" | sed 's/[|&\\]/\\&/g')
         sed -i "s|^${key}=.*|${key}=${esc}|" "$file"
     else
+        # 文件末尾可能缺换行（用户手工编辑过），直接追加会把新字段黏到上一行
+        if [ -n "$(tail -c 1 "$file")" ]; then
+            printf '\n' >> "$file"
+        fi
         printf '%s=%s\n' "$key" "$value" >> "$file"
     fi
     return 0

vps-xray/tests/test-restart-schedule.sh

@@ -139,6 +139,11 @@ is "字段总行数正确" "$(grep -c '^XRAY_RESTART_TIMEZONE=' "${TMP}/.env")"
 update_env_field "${TMP}/nonexistent" FOO bar 2>/dev/null
 is "文件不存在返回 1" "$?" "1"
 
+printf 'KEY=old' > "${TMP}/.env2"
+update_env_field "${TMP}/.env2" NEWKEY val
+is "缺尾换行时不黏连" "$(grep -c '^NEWKEY=val$' "${TMP}/.env2")" "1"
+is "缺尾换行时原字段完好" "$(grep -c '^KEY=old$' "${TMP}/.env2")" "1"
+
 echo ""
 echo "通过 ${PASS}，失败 ${FAIL}"
 [ "$FAIL" -eq 0 ]