feat: initial impl of file proxy

apps/file-proxy/convex.ts

@@ -0,0 +1,16 @@
+import { ConvexHttpClient } from "convex/browser"
+import { createMiddleware } from "hono/factory"
+
+const _client = new ConvexHttpClient(process.env.CONVEX_URL)
+
+export type ConvexContextVariables = {
+	convex: ConvexHttpClient
+}
+
+export const convexMiddleware = createMiddleware<{
+	Variables: ConvexContextVariables
+}>(async (c, next) => {
+	c.var
+	c.set("convex", _client)
+	await next()
+})