Update English key template examples

[auston314]

Update the English mykey.py template with clearer configuration examples:

• Add tested OpenRouter configuration sample.
• Clarify Telegram bot configuration placeholders.
• Add a note that WeChat bot integration is not supported for North America users, recommending Telegram or another supported channel instead.
• Keep the template valid Python (py_compile passed).

[lsdefine]

Thanks for the contribution. These files change frequently and small patches tend to conflict with ongoing work. Holding off for now.