feat(docs): move the site to prdcs.wiki on a Cloudflare Worker

Blume's cloudflare() adapter builds the docs as the prdcs-wiki Worker
(apps/docs/wrangler.jsonc: name, prdcs.wiki custom domain), and deploy.yml
ships it with wrangler instead of GitHub Pages. The SRS Worker's DOCS_URL /
DOCS_ORIGIN, release links and README badge follow the new domain.

apps/docs/blume.config.ts

@@ -1,4 +1,5 @@
 import { defineConfig } from "blume";
+import { cloudflare } from "blume/deploy";
 import type { StandardSchema } from "blume/core/standard-schema.ts";
 import { filesystem } from "blume/sources";
 import { APPENDIX } from "./appendix";
@@ -6,7 +7,7 @@ import { RECENCY, type Company } from "./companies";
 import redirects from "./redirects";
 
 // Blume's defaults (`inter`, `ibm-plex-mono`) are fetched from fonts.gstatic.com
-// on every build, which has timed out on the Pages runner and, fully offline,
+// on every build, which has timed out on the CI runner and, fully offline,
 // silently ships no fonts at all. The same two families from Fontsource, as
 // local files, keep the build network-free. Blume resolves `src` from this
 // directory; the workspace links these packages under ./node_modules.
@@ -92,9 +93,14 @@ export default defineConfig({
   title: "prdlk",
   description: "Documentation for my LeetCode solutions",
   logo: "./public/logo.svg",
-  deployment: {
-    site: "https://lc.prd.lk",
-  },
+  // A Cloudflare Workers server build (`@astrojs/cloudflare`), deployed by
+  // `wrangler deploy` with apps/docs/wrangler.jsonc (Worker name, the
+  // prdcs.wiki custom domain). Every page still prerenders; the Worker adds
+  // real HTTP redirects and `Accept: text/markdown` negotiation. Workers
+  // exposes no site URL to detect, so `site` is required.
+  deployment: cloudflare({
+    site: "https://prdcs.wiki",
+  }),
   github: {
     owner: "prdlk",
     repo: "leetcode",
@@ -127,10 +133,10 @@ export default defineConfig({
     structuredData: true,
     x: { handle: "@prdlk" },
   },
-  // Blume's own assistant route is server-rendered (it reads the provider key
-  // per request), which a static Pages build cannot ship. The SRS Worker
-  // answers instead (apps/api/src/ask.ts: OpenRouter, grounded on this site's
-  // llms-full.txt, which `agents.llmsTxt` publishes).
+  // Blume's own assistant route reads a provider key per request; the SRS
+  // Worker already holds that key and answers instead (apps/api/src/ask.ts:
+  // OpenRouter, grounded on this site's llms-full.txt, which `agents.llmsTxt`
+  // publishes), so this Worker carries no secrets.
   ai: {
     assistant: {
       enabled: true,