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/api/src/ask.ts

@@ -1,9 +1,9 @@
 /**
  * POST /ask — the docs assistant's backend.
  *
- * The docs are a static GitHub Pages site, and Blume's own assistant route is
- * server-rendered (it reads the provider key per request), so the site points
- * `ai.assistant.endpoint` here instead. This speaks the Blume island's wire
+ * Blume's own assistant route reads the provider key per request, and the
+ * docs Worker (apps/docs, `cloudflare()` build) holds no secrets, so the site
+ * points `ai.assistant.endpoint` here instead. This speaks the Blume island's wire
  * contract (`blume/components/islands/hooks.ts`):
  *
  * - request: `{ messages: [{ role, content }], page: { path } }` as JSON,

apps/api/src/index.ts

@@ -324,7 +324,7 @@ export default {
       if (path.startsWith("/admin/") && request.method === "POST") {
         return await handleAdmin(request, env, path);
       }
-      // The docs assistant (the static Pages site's `ai.assistant.endpoint`).
+      // The docs assistant (the docs site's `ai.assistant.endpoint`).
       if (path === "/ask") return await handleAsk(request, env);
 
       if (path === "/chart/progress.svg") {

apps/api/wrangler.jsonc

@@ -32,8 +32,8 @@
     "REPO": "prdlk/leetcode",
     "FROM_EMAIL": "srs@prdlk.com",
     "TO_EMAIL": "prnk28@gmail.com",
-    "DOCS_URL": "https://lc.prd.lk",
-    "DOCS_ORIGIN": "https://lc.prd.lk,https://prdlk.github.io",
+    "DOCS_URL": "https://prdcs.wiki",
+    "DOCS_ORIGIN": "https://prdcs.wiki",
     "PUBLIC_URL": "https://srs-api.prdlk.workers.dev",
     // The docs assistant's OpenRouter model (POST /ask). `:free` variants share
     // an upstream pool and answer 429 when it is saturated.