fix: refresh astrbot root path resolution

tests/test_astrbot_paths.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from astrbot.core.utils.astrbot_path import AstrbotPaths
+
+
+def test_astrbot_paths_root_tracks_environment_updates(monkeypatch, tmp_path: Path):
+    first_root = tmp_path / "first-root"
+    second_root = tmp_path / "second-root"
+
+    monkeypatch.setenv("ASTRBOT_ROOT", str(first_root))
+    paths = AstrbotPaths()
+
+    assert paths.root == first_root
+    assert paths.skills == first_root / "data" / "skills"
+
+    monkeypatch.setenv("ASTRBOT_ROOT", str(second_root))
+
+    assert paths.root == second_root
+    assert paths.skills == second_root / "data" / "skills"
+
+
+def test_astrbot_paths_root_override_remains_explicit(monkeypatch, tmp_path: Path):
+    monkeypatch.delenv("ASTRBOT_ROOT", raising=False)
+    paths = AstrbotPaths()
+    override_root = tmp_path / "override-root"
+
+    paths.root = override_root
+    monkeypatch.setenv("ASTRBOT_ROOT", str(tmp_path / "env-root"))
+
+    assert paths.root == override_root
+    assert paths.skills == override_root / "data" / "skills"