Split share.py into modules by responsibility

config.py  — share.config loading, constants, load_config(), client_cfg()
cert.py    — get_local_ip(), ensure_cert()
cleanup.py — cleanup_loop()
server.py  — ShareServer, Handler, file_type()
share.py   — main() entry point only

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cleanup.py

@@ -0,0 +1,26 @@
+"""Periodic cleanup of expired files."""
+
+import time
+from pathlib import Path
+
+from config import CLEANUP_INTERVAL
+
+
+def cleanup_loop(upload_dir: Path, max_age: int):
+    if max_age <= 0:
+        return
+    while True:
+        time.sleep(CLEANUP_INTERVAL)
+        now = time.time()
+        try:
+            entries = list(upload_dir.iterdir())
+        except OSError as e:
+            print(f"  cleanup error: {e}")
+            continue
+        for f in entries:
+            try:
+                if f.is_file() and now - f.stat().st_mtime > max_age:
+                    f.unlink()
+                    print(f"  - expired: {f.name}")
+            except OSError:
+                pass