feat: add whatsapp web qr chat channel (#16238)

Adds a WhatsApp chat channel backed by a QR-based web login flow so users can connect without manual token setup.

api/channels/bootstrap.py

@@ -33,7 +33,16 @@ import threading
 LOGGER = logging.getLogger(__name__)
 
 # Channel packages bundled under api/channels that self-register on import.
-_BUNDLED_CHANNELS = ("feishu", "discord", "telegram", "line", "wecom", "qqbot", "dingtalk")
+_BUNDLED_CHANNELS = (
+    "feishu",
+    "discord",
+    "telegram",
+    "line",
+    "wecom",
+    "qqbot",
+    "dingtalk",
+    "whatsapp",
+)
 
 # How often (seconds) to reconcile running channels against the database.
 _RECONCILE_INTERVAL_SECS = 10
@@ -144,7 +153,10 @@ def _make_chat_handler(ch):
 
         answer_text = ""
         try:
-            async for ans in async_chat(dia, history, False, quote=False):
+            chat_kwargs = {"quote": False}
+            if "{knowledge}" in (dia.prompt_config or {}).get("system", ""):
+                chat_kwargs["knowledge"] = ""
+            async for ans in async_chat(dia, history, False, **chat_kwargs):
                 structure_answer(conv, ans, message_id, conv.id)
                 answer_text = (ans or {}).get("answer", "") or ""
                 ConversationService.update_by_id(conv.id, conv.to_dict())
@@ -228,6 +240,18 @@ async def _reconcile(running: dict, failed: dict) -> None:
         if account_id not in desired or desired[account_id][2] != failed[account_id]:
             failed.pop(account_id, None)
 
+    active_whatsapp = any(channel == "whatsapp" for channel, _, _ in desired.values())
+    if not active_whatsapp:
+        active_whatsapp = any(
+            entry["ch"].channel_id == "whatsapp" for entry in running.values()
+        )
+    from api.channels.whatsapp.gateway import sync_whatsapp_gateway
+
+    try:
+        await sync_whatsapp_gateway(active_whatsapp)
+    except Exception:
+        LOGGER.exception("failed to sync WhatsApp gateway enabled=%s", active_whatsapp)
+
     # Start channels that are new (skip ones already known to fail with this config).
     for account_id, (channel, credential, fp) in desired.items():
         if account_id in running or failed.get(account_id) == fp: