Add WeWork XiaoAi TTS bot - WeChat Work long connection bridge

Receives messages from WeChat Work bot via WebSocket long connection
and speaks them through XiaoAi smart speaker TTS.

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

config.py

@@ -0,0 +1,43 @@
+import os
+from pathlib import Path
+from dotenv import load_dotenv
+
+load_dotenv()
+
+
+def _env(key: str, default: str = "") -> str:
+    return os.getenv(key, default)
+
+
+def _env_bool(key: str, default: bool = True) -> bool:
+    val = os.getenv(key, "").lower()
+    if val in ("0", "false", "no"):
+        return False
+    if val in ("1", "true", "yes"):
+        return True
+    return default
+
+
+def _env_int(key: str, default: int) -> int:
+    try:
+        return int(os.getenv(key, ""))
+    except (ValueError, TypeError):
+        return default
+
+
+# WeChat Work Bot
+WECOM_BOT_ID = _env("WECOM_BOT_ID")
+WECOM_BOT_SECRET = _env("WECOM_BOT_SECRET")
+
+# Xiaomi TTS
+XIAOMI_USER_ID = _env("XIAOMI_USER_ID", "1136458602")
+XIAOMI_TOKEN_PATH = _env(
+    "XIAOMI_TOKEN_PATH",
+    str(Path(__file__).resolve().parent / ".mi.token"),
+)
+XIAOMI_SPEAKER_DID = _env("XIAOMI_SPEAKER_DID", "3ba2c1e8-d8cb-45c5-b88a-15624e7a02f3")
+
+# TTS
+TTS_ENABLED = _env_bool("TTS_ENABLED", True)
+TTS_MAX_TEXT_LENGTH = _env_int("TTS_MAX_TEXT_LENGTH", 500)
+TTS_TIMEOUT_SECONDS = _env_int("TTS_TIMEOUT_SECONDS", 15)