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/wrangler.jsonc

@@ -0,0 +1,22 @@
+// Docs Worker — the Blume site, built by `blume build` with the `cloudflare()`
+// deploy adapter (blume.config.ts) and shipped by `wrangler deploy` from this
+// directory. Blume's build merges this file into dist/server/wrangler.json
+// (main, assets, the text/markdown negotiation wrapper) and writes the
+// .wrangler/deploy/ redirect wrangler follows, so only what Blume cannot
+// know lives here: the Worker's name and its domain.
+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  "name": "prdcs-wiki",
+  "compatibility_date": "2026-08-24",
+  "observability": { "enabled": true },
+
+  // prdcs.wiki is a zone on the same Cloudflare account; `custom_domain`
+  // makes wrangler create the DNS record and certificate on deploy.
+  "routes": [{ "pattern": "prdcs.wiki", "custom_domain": true }],
+  "workers_dev": false,
+
+  // Blume writes every page as <route>/index.html and links it without the
+  // slash; Cloudflare's default would answer `/x` with a 307 to `/x/` on any
+  // path the static layer serves ahead of the Worker.
+  "assets": { "html_handling": "drop-trailing-slash" }
+}