fix(qqbot): approval button clicks rejected for DM sessions

[RCMartinChen]

Problem

QQ Bot approval button clicks are always rejected in DM (private chat) sessions, causing the agent to wait the full 60-second approval timeout on every tool call that requires approval.

Root cause: build_session_key (in gateway/session.py) uses "dm" as the chat_type for private chats, producing session keys like:

agent:main:qqbot:dm:3760DA980EE3BBA3476394E834F7A3AE

But _is_authorized_interaction_for_session (in gateway/platforms/qqbot/adapter.py) checks for "c2c":

if chat_type == "c2c":  # "dm" != "c2c" → always returns False

This means every approval button click is rejected as unauthorized. The agent falls back to waiting for the 60-second timeout, adding massive latency to any operation involving tool approval.

Evidence

From gateway logs — 72 total approval rejections, all with the same pattern:

[QQBot:1903948564] Rejected unauthorized approval click for session
agent:main:qqbot:dm:3760DA980EE3BBA3476394E834F7A3AE
(operator=3760DA980EE3BBA3476394E834F7A3AE)

Average response time was 277 seconds (median 56s), with the worst case at 3744 seconds (~62 minutes). After the fix, operations that don't need tool approval complete in 10-40 seconds.

Fix

Accept both "c2c" (QQ API native term) and "dm" (canonical session key form) in the authorization check:

# Before
if chat_type == "c2c":
# After
if chat_type in {"c2c", "dm"}:

Only the authorization check in _is_authorized_interaction_for_session is changed. The other chat_type == "c2c" checks in the message sending path (lines 2475, 2602, 2924) correctly use _guess_chat_type() which returns QQ-native types — those are unaffected.

Testing

Verified by analyzing 113 QQ bot responses from gateway logs spanning June 3-20, 2026. The fix is live on my instance and approval buttons now work correctly in DM sessions.

[alt-glitch]

Duplicate of #31593 — both fix the QQBot DM approval-button rejection by changing _is_authorized_interaction_for_session in gateway/platforms/qqbot/adapter.py so the c2c branch also accepts the dm chat_type (if chat_type in {"c2c", "dm"}:). #31593 (opened 2026-05-24) is the earliest still-open PR with this identical one-line fix. Related open items: issue #35760 / #40655 (root cause), competing fix PRs #40926 and #43957.

[RCMartinChen]

Closing as duplicate of #31593, which has the same fix with test coverage. Added production performance data there to help push for merge.