feat: add /debug slash command for all platforms

Adds /debug as a slash command available in CLI, Telegram, Discord,
Slack, and all other gateway platforms. Uploads debug report + full
logs to paste services and returns shareable URLs.

- commands.py: CommandDef in Info category (no cli_only/gateway_only)
- gateway/run.py: async handler with run_in_executor for blocking I/O
- cli.py: dispatch in process_command to run_debug_share

hermes_cli/commands.py

@@ -154,6 +154,7 @@ COMMAND_REGISTRY: list[CommandDef] = [
                cli_only=True, args_hint="<path>"),
     CommandDef("update", "Update Hermes Agent to the latest version", "Info",
                gateway_only=True),
+    CommandDef("debug", "Upload debug report (system info + logs) and get shareable links", "Info"),
 
     # Exit
     CommandDef("quit", "Exit the CLI", "Exit",