v0.5.84: matches origin filter, mobile gate, refresh reliability.

Ship Web refresh cache/lock, mobile demand gate, matches 职业/国服 filter, and related site updates through 0.5.84.

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

shared/http_utils.py

@@ -7,6 +7,8 @@ timeout, and retry conventions live in exactly one place.
 from __future__ import annotations
 
 import json
+import os
+import tempfile
 import time
 import urllib.error
 import urllib.request
@@ -22,6 +24,36 @@ HEROES_URL = "https://www.dota2.com/datafeed/herolist?language={lang}"
 ITEMLIST_URL = "https://www.dota2.com/datafeed/itemlist?language={lang}"
 
 
+def write_json_atomic(
+    path: Path,
+    payload,
+    *,
+    indent: int | None = 2,
+    separators: tuple[str, str] | None = None,
+) -> None:
+    """Atomically replace a UTF-8 JSON file after flushing it to disk."""
+    path.parent.mkdir(parents=True, exist_ok=True)
+    text = json.dumps(
+        payload,
+        ensure_ascii=False,
+        indent=indent,
+        separators=separators,
+    )
+    if indent is not None:
+        text += "\n"
+    fd, tmp_name = tempfile.mkstemp(prefix=f".{path.name}.", suffix=".tmp", dir=path.parent)
+    tmp = Path(tmp_name)
+    try:
+        with os.fdopen(fd, "w", encoding="utf-8", newline="\n") as f:
+            f.write(text)
+            f.flush()
+            os.fsync(f.fileno())
+        os.replace(tmp, path)
+    except BaseException:
+        tmp.unlink(missing_ok=True)
+        raise
+
+
 def _http_open(url: str, *, timeout: int, retries: int, backoff: float):
     """urlopen with retries on 429 / 5xx / transient network errors."""
     last_err: BaseException | None = None