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/guides/manage-oauth2.mdx

@@ -0,0 +1,26 @@
+---
+title: "Override OAuth2 Apps"
+description: "Use your own OAuth2 credentials instead of the default Activepieces apps"
+icon: "lock"
+---
+
+<Snippet file="enterprise-feature.mdx" />
+
+## Default Behavior
+
+When users connect to services like Google Sheets or Slack, they see "Activepieces" as the app requesting access. This works out of the box with no setup required.
+
+## Why Replace OAuth2 Apps?
+
+- **Branding**: Show your company name instead of "Activepieces" in authorization screens
+- **Higher Limits**: Some services have stricter rate limits for shared OAuth apps
+- **Compliance**: Your organization may require using company-owned credentials
+
+## How to Configure
+
+1. Go to **Platform Admin → Setup → Pieces**
+2. Find the piece you want to configure (e.g., Google Sheets)
+3. Click the lock icon to open the OAuth2 settings
+4. Enter your own Client ID and Client Secret
+
+![Manage Oauth2 apps](/resources/screenshots/manage-oauth2.png)