fix(qqbot): support Windows local media sends

[LeonSGP43]

What does this PR do?

Fixes the QQBot local-media delivery path for Windows-origin screenshot workflows. send_message can now hand QQBot media files to the live gateway adapter, and the gateway path extraction helpers now normalize Windows file://... image URLs plus bare absolute Windows media paths so those files are treated as attachments instead of leaked text.

This is adjacent to, but not the same as, the older QQBot live-send PR for #23825: this change specifically covers media-only sends and Windows local path extraction for #26041.

Related Issue

Fixes #26041

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• export and track the active QQBot adapter instance across connect/reconnect/disconnect
• route QQBot send_message media files through the live adapter's native upload methods
• parse and clean HTML <img src=...> file:// URLs, including Windows drive-letter forms
• detect absolute Windows media paths in extract_local_files()
• add regression coverage for QQBot live-adapter routing and Windows local media extraction

How to Test

1. uv run --frozen --extra dev --extra messaging python -m pytest -o addopts='' tests/gateway/test_platform_base.py tests/gateway/test_extract_local_files.py tests/gateway/test_qqbot.py tests/tools/test_send_message_tool.py
2. uv run --frozen --extra dev ruff check gateway/platforms/base.py gateway/platforms/qqbot/adapter.py gateway/platforms/qqbot/__init__.py tools/send_message_tool.py tests/gateway/test_platform_base.py tests/gateway/test_extract_local_files.py tests/gateway/test_qqbot.py tests/tools/test_send_message_tool.py
3. In a live QQBot session, send a tool result containing MEDIA:C:\Users\...\shot.png or <img src="file:///C:/Users/.../shot.png" /> and confirm the screenshot is uploaded as media instead of left in the text body.

Notes

• Targeted local proof on commit 83ecdeb65e1515876a0078ccba415a219b0a41c3 is green.
• Recent company Hermes PRs share unrelated GitHub baseline-red lanes; no candidate-specific failure was found locally.

[teknium1]

Thanks for tackling QQBot media delivery. The Windows raw-path part has since landed on main, but QQBot standalone media delivery remains needed.

Problems

• The new live-adapter-only route would not cover documented standalone callers. hermes send wraps this shared send engine outside the gateway process (hermes_cli/send_cmd.py:4-20), and cron invokes _send_to_platform() in a fresh event loop (cron/scheduler.py:1902-1904). A process-local adapter singleton cannot be present in those callers.
• The Windows bare-path extraction changes are superseded by 51d165a8e: current gateway/platforms/base.py:3728-3731 already handles C:\\... and C:/..., with regression tests at tests/gateway/test_extract_local_files.py:342-361.

Suggested changes

• Re-scope the salvage to a QQBot standalone/direct sender for media, with tests for CLI/cron delivery; retain a live adapter only as an optional fast path.

Automated hermes-sweeper review.

[teknium1]

This branch only works when the caller shares a process with a live QQBot adapter. hermes send and cron invoke the same send engine standalone, so get_active_adapter() will be empty there; please provide a standalone/direct QQBot media sender or an explicit fallback.