feat(infra): add current CF workers

infra/cloudflare-workers/README.md

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+Currently manually copy/paste/deploy via Cloudflare Portal UI.

infra/cloudflare-workers/filterlists-api-host-rewrite-worker.js

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+/**
+ * Cloudflare Worker for api.filterlists.com
+ *
+ * This worker enables two key functionalities:
+ * 1. Azure App Service Free Tier Custom Domain: Proxies requests to `app-filterlists-directory-prod.azurewebsites.net`, allowing a custom domain (`api.filterlists.com`) with Azure's free tier.
+ * 2. Respect Origin Cache-Control: Ensures Cloudflare's edge cache (via Cache API) honors the `Cache-Control` headers sent by the origin for all successful responses, optimizing caching for JSON APIs and static assets.
+ */
+export default {
+  async fetch(request, _, ctx) {
+    const cache = caches.default;
+    const cacheKey = request;
+
+    let response = await cache.match(cacheKey);
+
+    if (response) {
+      return response;
+    }
+
+    const url = new URL(request.url);
+    const azureHostname = "app-filterlists-directory-prod.azurewebsites.net";
+    const originUrl = `https://${azureHostname}${url.pathname}${url.search}`;
+    const originRequest = new Request(originUrl, request);
+
+    originRequest.headers.set("Host", azureHostname);
+
+    response = await fetch(originRequest);
+
+    if (response.ok) {
+      const responseToCache = response.clone();
+      ctx.waitUntil(cache.put(cacheKey, responseToCache));
+    }
+
+    return response;
+  },
+};

infra/cloudflare-workers/filterlists-next-host-rewrite-worker.js

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+/**
+ * Cloudflare Worker for next.filterlists.com
+ *
+ * Azure App Service Free Tier Custom Domain: Proxies requests to `app-filterlists-web-prod-h2hecsdqbrach3dt.eastus2-01.azurewebsites.net`, allowing a custom domain (`next.filterlists.com`) with Azure's free tier.
+ */
+export default {
+  async fetch(request, _, __) {
+    const url = new URL(request.url);
+    const azureHostname = "app-filterlists-web-prod-h2hecsdqbrach3dt.eastus2-01.azurewebsites.net";
+    const originUrl = `https://${azureHostname}${url.pathname}${url.search}`;
+    const originRequest = new Request(originUrl, request);
+
+    // re-write Host header to trick App Service free tier into supporting custom domain
+    originRequest.headers.set("Host", azureHostname);
+
+    // delete cookie to trick Cloudflare into caching static HTML
+    originRequest.headers.delete('cookie');
+    
+    return await fetch(originRequest);
+  },
+};