general: use less explicit kompress boilerplate in modules

now get_files/kompress library can handle it transparently

my/core/_deprecated/kompress.py

@@ -257,4 +257,8 @@ class ZipPath(zipfile_Path):
         )
         return os.stat_result(tuple(params.values()))
 
+    @property
+    def suffix(self) -> str:
+        return Path(self.parts[-1]).suffix
+
 # fmt: on

my/core/structure.py

@@ -123,7 +123,8 @@ def match_structure(
 
             searchdir = Path(tempfile.mkdtemp(dir=tdir))
 
-            zf = zipfile.ZipFile(base)
+            # base might already be a ZipPath, and str(base) would end with /
+            zf = zipfile.ZipFile(str(base).rstrip('/'))
             zf.extractall(path=str(searchdir))
 
         else: