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/react-ui/postcss.config.js

@@ -0,0 +1,12 @@
+const { join } = require('path');
+
+// Note: If you use library-specific PostCSS/Tailwind configuration then you should remove the `postcssConfig` build
+// option from your application's configuration (i.e. project.json).
+//
+// See: https://nx.dev/guides/using-tailwind-css-in-react#step-4:-applying-configuration-to-libraries
+
+module.exports = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};