feat: introduce marketing mode and update sidebar display

- Added a new configuration flag `IS_MARKETING` to toggle marketing mode.
- Updated the sidebar component to conditionally display the marketing URL when in marketing mode.
- Refactored event type naming for consistency in the sidebar logic.
- Cleaned up formatting in the HttpApiClient for improved readability.

apps/app/src/config/app-config.ts

@@ -0,0 +1,6 @@
+/**
+ * Marketing mode flag
+ * When set to true, displays "https://automaker.app" with "maker" in theme color
+ */
+
+export const IS_MARKETING = process.env.NEXT_PUBLIC_IS_MARKETING === "true";