[TrueFurina]

Add timeout to urllib.request.urlopen calls in feishu_bot_creator

Two urllib.request.urlopen() calls in the Feishu greeting flow had
no timeout. If the open.feishu.cn endpoint is unreachable (network
partition, DNS stall, or TLS handshake timeout), the call blocks the
bot creator indefinitely:

1. POST /auth/v3/tenant_access_token/internal — fetch tenant token
2. POST /im/v1/messages — send the initial greeting message

Both are wrapped in broad except Exception blocks, so adding
timeout=30 lets the except path take over on network failures instead
of deadlocking. The sibling yuanbao_bot_creator already uses timeout=30
for the same endpoint family.