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/gamma/src/lib/common/auth.ts

@@ -0,0 +1,50 @@
+import { PieceAuth } from "@activepieces/pieces-framework";
+import { HttpError, HttpMethod, httpClient } from "@activepieces/pieces-common";
+
+const markdownDescription = `
+Follow these steps to get your Gamma API Key:
+
+1.  Log in to your Gamma account. You must have a **Pro or Ultra plan** to access the API.
+2.  Navigate to **Settings & Members** (click your workspace name in the top-left).
+3.  Go to the **API Key** tab.
+4.  Click **Create API key** and give it a name (e.g., "Activepieces").
+5.  Copy the key (it starts with \`sk-gamma-\`) and paste it below.
+
+**Direct Link to API Settings:** [**https://gamma.app/settings/api**](https://gamma.app/settings/api)
+`;
+
+export const gammaAuth = PieceAuth.CustomAuth({
+  description: markdownDescription,
+  required: true,
+  props: {
+    apiKey: PieceAuth.SecretText({
+      displayName: "API Key",
+      description: "Paste your API key here.",
+      required: true,
+    }),
+  },
+  async validate(auth) { 
+    const apiKey = auth.auth.apiKey; 
+    
+    try {
+      await httpClient.sendRequest({
+        method: HttpMethod.GET,
+        url: 'https://public-api.gamma.app/v0.2/generations/1', 
+        headers: {
+          'X-API-KEY': apiKey, 
+        },
+      });
+      return { valid: true };
+    } catch (e) {
+      if (e instanceof HttpError) {
+        if (e.response.status === 404) {
+          return { valid: true };
+        }
+        if (e.response.status === 401) {
+          return { valid: false, error: 'Invalid API Key' };
+        }
+      }
+      return { valid: false, error: 'Failed to connect to Gamma API' };
+    }
+  },
+});