fix(qqbot): authorize dm approval interactions

[Diyoncrz18]

Fixes #35760
Refs #40655

What does this PR do?

This fixes QQBot approval interaction authorization for direct-message sessions.

Hermes creates QQBot direct-message sessions with chat_type="dm", while the QQBot approval authorization check only treated chat_type="c2c" as a direct chat. As a result, approval button clicks from QQ direct messages could be rejected even when the operator matched the chat id.

This PR treats both c2c and dm as QQBot direct chat types for approval authorization while preserving the existing operator == chat_id check.

Changes Made

• Allow QQBot approval authorization for dm direct-message session keys.
• Preserve existing c2c behavior.
• Keep mismatched operators rejected.
• Add regression coverage for dm approval clicks and c2c backward compatibility.

How to Test

1. Simulate a QQBot approval interaction for a session key like agent:main:qqbot:dm:<chat_id>.
2. Use the same QQ operator id as <chat_id>.
3. Verify the interaction is authorized.
4. Verify mismatched operators are still rejected.

Validation

Run locally:

python -m py_compile gateway/platforms/qqbot/adapter.py tests/gateway/test_qqbot.py
git diff --check

Not run locally:

pytest tests/gateway/test_qqbot.py -q
python -m pytest tests/gateway/test_qqbot.py -q

[alt-glitch]

Duplicate of #31593 — this is part of the large QQBot DM-approval one-line-fix cluster (treat chat_type 'dm' the same as 'c2c' for approval authorization, fixing #35760/#32528). #31593 is the earliest still-open PR in the cluster; other open siblings include #32752, #36774, #40705, #40926, #41801. Marking duplicate for cluster consolidation.

[Diyoncrz18]

Closing this as a duplicate of #31593 for the QQBot DM approval authorization cluster consolidation. Thanks for checking and consolidating the related PRs.