fix: avoid treating Feishu file paths as commands (#1654)

Feishu channel classified any slash-prefixed text (including absolute
paths such as /mnt/user-data/...) as a COMMAND, causing them to be
misrouted through the command pipeline instead of the chat pipeline.

Fix by introducing a shared KNOWN_CHANNEL_COMMANDS frozenset in
app/channels/commands.py — the single authoritative source for the set
of supported slash commands.  Both the Feishu inbound parser and the
ChannelManager's unknown-command reply now derive from it, so adding
or removing a command requires only one edit.

Changes:
- app/channels/commands.py (new): defines KNOWN_CHANNEL_COMMANDS
- app/channels/feishu.py: replace local KNOWN_FEISHU_COMMANDS with the
  shared constant; _is_feishu_command() now gates on it
- app/channels/manager.py: import KNOWN_CHANNEL_COMMANDS and use it in
  the unknown-command fallback reply so the displayed list stays in sync
- tests/test_feishu_parser.py: parametrize over every entry in
  KNOWN_CHANNEL_COMMANDS (each must yield msg_type=command) and add
  parametrized chat cases for /unknown, absolute paths, etc.

Made with Cursor

Made-with: Cursor

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

backend/app/channels/feishu.py

@@ -9,11 +9,18 @@ import threading
 from typing import Any
 
 from app.channels.base import Channel
+from app.channels.commands import KNOWN_CHANNEL_COMMANDS
 from app.channels.message_bus import InboundMessageType, MessageBus, OutboundMessage, ResolvedAttachment
 
 logger = logging.getLogger(__name__)
 
 
+def _is_feishu_command(text: str) -> bool:
+    if not text.startswith("/"):
+        return False
+    return text.split(maxsplit=1)[0].lower() in KNOWN_CHANNEL_COMMANDS
+
+
 class FeishuChannel(Channel):
     """Feishu/Lark IM channel using the ``lark-oapi`` WebSocket client.
 
@@ -509,8 +516,9 @@ class FeishuChannel(Channel):
                 logger.info("[Feishu] empty text, ignoring message")
                 return
 
-            # Check if it's a command
-            if text.startswith("/"):
+            # Only treat known slash commands as commands; absolute paths and
+            # other slash-prefixed text should be handled as normal chat.
+            if _is_feishu_command(text):
                 msg_type = InboundMessageType.COMMAND
             else:
                 msg_type = InboundMessageType.CHAT