fix: prevent browser process leaks and improve robustness

- fix(browser): wrap context lifecycle in try/finally to ensure browser
  closes on exceptions and KeyboardInterrupt (login, sniffer, generator)
- fix(browser): replace time.sleep with Playwright native waits
  (wait_for, wait_for_timeout) for more reliable element interaction
- fix(browser): use parameterized page.evaluate instead of f-string
  JS injection in generator polling
- fix(api): add retry logic in wait_for_completion to survive transient
  network errors
- fix(config): add prepare_profile_dir to copy profile to temp dir,
  preventing Chromium SingletonLock conflicts when tools run concurrently
- fix(sniffer): stream API logs to tempfile instead of unbounded memory
  list to avoid OOM
- fix(api): specify encoding='utf-8' when loading cookies from file

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

hunyuan3dweb/config.py

@@ -1,5 +1,8 @@
 import os
+import shutil
+import tempfile
 from pathlib import Path
+from typing import Optional, Tuple
 
 
 def get_config_dir() -> Path:
@@ -21,3 +24,21 @@ def get_profile_dir() -> Path:
     path = get_config_dir() / "profile"
     path.mkdir(parents=True, exist_ok=True)
     return path
+
+
+def prepare_profile_dir() -> Tuple[str, Optional[str]]:
+    """
+    将标准 profile 复制到临时目录，避免 Chromium 锁冲突。
+
+    Returns:
+        (实际使用的 profile 路径, 临时目录路径或 None)。
+        如果使用了临时副本，调用者应在完成后用 shutil.rmtree 删除。
+    """
+    standard = str(get_profile_dir())
+    if not os.path.exists(standard):
+        return standard, None
+
+    temp_root = tempfile.mkdtemp(prefix="hunyuan3dweb-profile-")
+    temp_profile = os.path.join(temp_root, "profile")
+    shutil.copytree(standard, temp_profile, dirs_exist_ok=True)
+    return temp_profile, temp_root