Add Activepieces integration for workflow automation

- Add Activepieces fork with SmoothSchedule custom piece
- Create integrations app with Activepieces service layer
- Add embed token endpoint for iframe integration
- Create Automations page with embedded workflow builder
- Add sidebar visibility fix for embed mode
- Add list inactive customers endpoint to Public API
- Include SmoothSchedule triggers: event created/updated/cancelled
- Include SmoothSchedule actions: create/update/cancel events, list resources/services/customers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

activepieces-fork/packages/pieces/community/convertkit/README.md

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+# Notes
+
+## Untested pieces
+
+The following webhook trigger event types (https://developers.convertkit.com/#webhooks) have been implemented but not yet fully tested.
+
+- subscriber.subscriber_complain
+
+- subscriber.product_purchase
+
+- purchase.purchase_create
+
+<!-- If you run into problems with these events, please create an issue and tag/message me (gunther@mailcraft.co). -->
+
+## No debounce in form fields
+
+I have not implemented a debounce in any form fields. This means that calls to the ConvertKit API will be triggered on every keystroke for certain fields.
+
+I have raised an issue here: https://github.com/activepieces/activepieces/issues/3142
+
+# Building
+
+Run `nx build pieces-convertkit` to build the library.
+
+# ToDo
+
+- Versioning of piece https://www.activepieces.com/docs/developers/piece-reference/piece-versioning
+- Debounce on form fields
+- Add tests(?)