Fix path retrieval for twenty apps in twenty-cli (#14818)

## Context

Now should not confuse package.json from non-twenty apps but check if
$schema correctly targets twenty manifest json
<img width="741" height="422" alt="Screenshot 2025-10-01 at 17 34 45"
src="https://github.com/user-attachments/assets/5b9e729e-8634-4eb8-a2a9-4991a63d49f0"
/>

packages/twenty-cli/src/constants/schemas.ts

@@ -0,0 +1,6 @@
+const SCHEMA_BASE_URL =
+  'https://raw.githubusercontent.com/twentyhq/twenty/main/packages/twenty-cli/schemas';
+
+export const APP_MANIFEST_SCHEMA_URL = `${SCHEMA_BASE_URL}/app-manifest.schema.json`;
+export const AGENT_SCHEMA_URL = `${SCHEMA_BASE_URL}/agent.schema.json`;
+export const OBJECT_SCHEMA_URL = `${SCHEMA_BASE_URL}/object.schema.json`;