feat: add QQ Bot platform adapter (Official API v2)

Add full QQ Bot integration via the Official QQ Bot API (v2):
- WebSocket gateway for inbound events (C2C, group, guild, DM)
- REST API for outbound text/markdown/media messages
- Voice transcription (Tencent ASR + configurable STT provider)
- Attachment processing (images, voice, files)
- User authorization (allowlist + allow-all + DM pairing)

Integration points:
- gateway: Platform.QQ enum, adapter factory, allowlist maps
- CLI: setup wizard, gateway config, status display, tools config
- tools: send_message cross-platform routing, toolsets
- cron: delivery platform support
- docs: QQ Bot setup guide

hermes_cli/gateway.py

@@ -1913,6 +1913,30 @@ _PLATFORMS = [
              "help": "Phone number or Apple ID to deliver cron results and notifications to."},
         ],
     },
+    {
+        "key": "qq",
+        "label": "QQ Bot",
+        "emoji": "💬",
+        "token_var": "QQ_APP_ID",
+        "setup_instructions": [
+            "1. Go to https://open.qq.com/ and create an application",
+            "2. In the application dashboard, create a QQ Bot",
+            "3. Note your App ID and App Secret",
+            "4. Configure the WebSocket Gateway URL in QQ Open Platform settings",
+            "5. Set up message push URL if needed for event callbacks",
+        ],
+        "vars": [
+            {"name": "QQ_APP_ID", "prompt": "App ID", "password": False,
+             "help": "Paste the App ID from QQ Open Platform."},
+            {"name": "QQ_CLIENT_SECRET", "prompt": "App Secret", "password": True,
+             "help": "Paste the App Secret from QQ Open Platform."},
+            {"name": "QQ_ALLOWED_USERS", "prompt": "Allowed QQ user IDs (comma-separated, or empty for DM pairing)", "password": False,
+             "is_allowlist": True,
+             "help": "Optional — pre-authorize specific users. Leave empty to use DM pairing instead."},
+            {"name": "QQ_HOME_CHANNEL", "prompt": "Home channel (QQ group ID for cron/notifications, or empty)", "password": False,
+             "help": "QQ group ID to deliver cron results and notifications to."},
+        ],
+    },
 ]