fix: webhook platform support — skip home channel prompt, disable tool progress (salvage #4363) (#4660)

Cherry-picked from PR #4363 by @bennyhodl with follow-up fixes:

- Skip 'No home channel' prompt for webhook platform (webhooks deliver
  to configured targets, not a home channel)
- Disable tool progress for webhooks (no message editing support)
- Add webhook to PLATFORMS in tools_config.py and skills_config.py
- Add hermes-webhook toolset to toolsets.py + hermes-gateway includes
- Removed overly aggressive <50 char content filter that blocked
  legitimate short responses (tool progress already handled at source)

Co-authored-by: bennyhodl <bennyhodl@users.noreply.github.com>

hermes_cli/skills_config.py

@@ -30,6 +30,7 @@ PLATFORMS = {
     "dingtalk": "💬 DingTalk",
     "feishu": "🪽 Feishu",
     "wecom": "💬 WeCom",
+    "webhook": "🔗 Webhook",
 }
 
 # ─── Config Helpers ───────────────────────────────────────────────────────────

hermes_cli/tools_config.py

@@ -150,6 +150,7 @@ PLATFORMS = {
     "wecom": {"label": "💬 WeCom", "default_toolset": "hermes-wecom"},
     "api_server": {"label": "🌐 API Server", "default_toolset": "hermes-api-server"},
     "mattermost": {"label": "💬 Mattermost", "default_toolset": "hermes-mattermost"},
+    "webhook": {"label": "🔗 Webhook", "default_toolset": "hermes-webhook"},
 }