feat(anthropic): add anthropic app with send message action

packages/docs/pages/apps/anthropic/actions.md

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+---
+favicon: /favicons/anthropic.svg
+items:
+  - name: Send message
+    desc: Sends a structured list of input messages with text content, and the model will generate the next message in the conversation.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

packages/docs/pages/apps/anthropic/connection.md

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+# Anthropic
+
+1. Go to [API Keys page](https://console.anthropic.com/settings/keys) on Anthropic.
+2. Create a new key.
+3. Paste the key into the `API Key` field in Automatisch.
+4. Write any screen name to be displayed in Automatisch.
+5. Click `Save`.
+6. Start using Anthropic integration with Automatisch!