支持 Ubuntu 一键部署与 PM2，并增加系统设置改密。

默认账号改为 admin/admin123，去掉 Windows 部署说明，与客户端同套部署流程。

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

lib/env_lib.py

@@ -0,0 +1,55 @@
+"""Hub .env 读写(仅中控账号等少量键)."""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+from typing import Dict, List
+
+_KEY_RE = re.compile(r"^([A-Za-z_][A-Za-z0-9_]*)=(.*)$")
+
+
+def _parse_line(line: str) -> tuple[str | None, str]:
+    raw = line.rstrip("\n\r")
+    if not raw.strip() or raw.lstrip().startswith("#"):
+        return None, raw
+    m = _KEY_RE.match(raw)
+    if not m:
+        return None, raw
+    return m.group(1), raw
+
+
+def apply_env_updates(path: Path | str, updates: Dict[str, str]) -> List[str]:
+    """更新或追加 .env 键;返回实际写入的 key 列表.不删其它行."""
+    env_path = Path(path)
+    wanted = {str(k).strip(): str(v) for k, v in updates.items() if str(k).strip()}
+    if not wanted:
+        return []
+
+    lines: list[str] = []
+    if env_path.is_file():
+        lines = env_path.read_text(encoding="utf-8").splitlines(keepends=True)
+
+    seen: set[str] = set()
+    out: list[str] = []
+    changed: list[str] = []
+
+    for line in lines:
+        key, _ = _parse_line(line)
+        if key and key in wanted:
+            out.append(f"{key}={wanted[key]}\n")
+            seen.add(key)
+            changed.append(key)
+        else:
+            if line.endswith("\n") or line.endswith("\r"):
+                out.append(line if line.endswith("\n") else line + "\n")
+            else:
+                out.append(line + "\n")
+
+    for key, val in wanted.items():
+        if key not in seen:
+            out.append(f"{key}={val}\n")
+            changed.append(key)
+
+    env_path.parent.mkdir(parents=True, exist_ok=True)
+    env_path.write_text("".join(out), encoding="utf-8")
+    return changed