feat: add fallback redirect for cloudflare image optimization plugin

Introduced `fallbackRedirect` option to enable a redirect to the original image if image optimization fails. Added logging for platform proxy usage and adjusted `beforeBuild` to handle undefined `app`. Minor improvements and process termination for clear command flow.

app/src/adapter/cloudflare/proxy.ts

@@ -7,6 +7,7 @@ import {
 } from "bknd/adapter/cloudflare";
 import type { GetPlatformProxyOptions, PlatformProxy } from "wrangler";
 import process from "node:process";
+import { $console } from "bknd/utils";
 
 export type WithPlatformProxyOptions = {
    /**
@@ -25,6 +26,8 @@ export function withPlatformProxy<Env extends CloudflareEnv>(
       typeof opts?.useProxy === "boolean" ? opts.useProxy : process.env.PROXY === "1";
    let proxy: PlatformProxy | undefined;
 
+   $console.log("Using cloudflare platform proxy");
+
    async function getEnv(env?: Env): Promise<Env> {
       if (use_proxy) {
          if (!proxy) {