feat: end to end api type safety with redis rate limiting (#573)

* feat: support hono rpc

* add wrangler file

* update name of wrangler file

* add wrangler as a dependency

* add compatibility_flags

* trigger ci

* core: add health check to docker file

* expose port 80

* update custom healthcheck

* feat: implement openapi

* install dependencies in root

* debug yml

* update yml

* update port

* update dockerfile with envs

* completely move away from apiClient

* rename backend to api

* refactor: update server descriptions and comment out local spec saving

* update lock file

* use api.classroomio.com

* add support for redis

* fix: add missing line break in WelcomeModal.svelte

* refactor: remove wrangler configuration and update Vite config for API integration

apps/api/src/utils/upload.ts

@@ -0,0 +1,24 @@
+import { nanoid } from 'nanoid';
+import path from 'path';
+
+/**
+ * Safely extracts the file extension from a filename.
+ * Returns an empty string if no extension is found.
+ */
+export function getExtension(filename: string): string {
+  if (!filename || typeof filename !== 'string') return '';
+  const ext = path.extname(filename).split('.');
+  return ext.length > 1 ? ext[ext.length - 1] : '';
+}
+
+/**
+ * Generates a unique file key for storage, preserving the file extension.
+ * Throws an error if the filename is invalid or has no extension.
+ */
+export function generateFileKey(fileName: string): string {
+  const ext = getExtension(fileName);
+  if (!ext) {
+    throw new Error('Invalid file name or missing file extension');
+  }
+  return `${nanoid()}.${ext}`;
+}