Allow configuring custom WebSocket and API base URLs for WeCom
via optional credentials fields (ws_endpoint, api_base_url), enabling
integration with privately deployed WeCom instances.
Changes:
- LongConnClient and WebhookAdapter accept custom endpoint URLs
- Endpoint URLs validated at construction (scheme + SSRF check)
- Private deployment hostnames added to file download SSRF allowlist
- Frontend forms added for both WebSocket and Webhook modes
- i18n support for zh-CN, en-US, ru-RU, ko-KR
Uses default public cloud endpoints when not specified.
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30f349d06a