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/http-oauth2/src/index.ts

@@ -0,0 +1,42 @@
+import { createPiece, PieceAuth, Property } from "@activepieces/pieces-framework";
+import { httpOauth2RequestAction } from "./lib/actions/send-oauth2-http-request";
+
+export const httpOauth2Auth = PieceAuth.OAuth2({
+  description: 'OAuth2',
+  authUrl: '{authUrl}',
+  tokenUrl: '{tokenUrl}',
+  required: true,
+  scope: '{scopes}'.split(' '),
+  grantType: 'both_client_credentials_and_authorization_code',
+  props: {
+    authUrl: Property.ShortText({
+      displayName: 'Authorize URL',
+      required: true,
+      description: 'OAuth2 Authorize URL',
+    }),
+    tokenUrl: Property.ShortText({
+      displayName: 'Token URL',
+      required: true,
+      description: 'OAuth2 Token URL',
+    }),
+    scopes: Property.ShortText({
+      displayName: 'Scopes (whitespace separated)',
+      required: true,
+      description: 'OAuth2 Scopes',
+    }),
+  },
+});
+
+export const httpOauth2ClientCredentials = createPiece({
+  displayName: "HTTP (OAuth2)",
+  auth: httpOauth2Auth,
+  minimumSupportedRelease: '0.56.0',
+  logoUrl: "https://cdn.activepieces.com/pieces/http.png",
+  authors: [
+    'mhshiba'
+  ],
+  actions: [
+    httpOauth2RequestAction,
+  ],
+  triggers: [],
+});