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/docs/admin-guide/overview.mdx

@@ -0,0 +1,23 @@
+---
+title: "Overview"
+icon: "hand-wave"
+description: "Manage and customize your Activepieces instance"
+---
+
+The **Platform Admin** is the centralized admin panel for managing your Activepieces instance. It's designed for teams and organizations that want full control over users, integrations, security, and internal automation.
+
+## What Can You Do?
+
+With Platform Admin, you can:
+
+- **Custom Branding:** Tailor the appearance of Activepieces to match your organization's identity, including colors, logos, and fonts.
+
+- **Project Management:** Create, edit, and organize projects for internal teams and users.
+
+- **Piece Management:** Control which integration pieces are available, including managing custom or internal pieces for your team's workflows.
+
+- **User Management:** Add and remove users, send invitations, and assign roles and permissions.
+
+- **AI Provider Management:** Configure and manage AI providers (like OpenAI, Anthropic, etc.) available for use in your flows.
+
+- **SSO & Security:** Configure Single Sign-On (SSO) providers and manage security settings to ensure your instance is secure.