feat(sponsors): embeddable /sponsors.svg + /sponsors.png image router for READMEs

crons/refresh-sponsors.ts

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+// crons/refresh-sponsors.ts
+// Daily full re-render of the sponsors cache (force) so avatar/name changes that
+// never fire a sponsorship webhook are still picked up. 05:00 UTC = low traffic.
+import { defineScheduled } from 'void'
+import yogaWasm from 'satori/yoga.wasm'
+import resvgWasm from '@resvg/resvg-wasm/index_bg.wasm'
+import { loadSponsors } from '../lib/landing/load-sponsors.ts'
+import {
+  loadFonts,
+  readAsset,
+  type AssetsFetcher,
+} from '../lib/sponsors-image/fonts.ts'
+import { refreshSponsorsCache } from '../lib/sponsors-cache/refresh.ts'
+import type { KVStore, R2Store } from '../lib/sponsors-cache/store.ts'
+
+export const cron = '0 5 * * *'
+
+export default defineScheduled(async (_controller, env) => {
+  const e = env as unknown as {
+    KV: KVStore
+    STORAGE: R2Store
+    ASSETS: AssetsFetcher
+  }
+  // The scheduled context has no request URL; the ASSETS binding serves by path,
+  // so the host in the base URL is irrelevant — any absolute URL works.
+  const base = 'https://napi.rs/'
+  await refreshSponsorsCache({
+    kv: e.KV,
+    r2: e.STORAGE,
+    loadFresh: () => loadSponsors({ bypassCache: true }),
+    loadFonts: () => loadFonts((p) => readAsset(e.ASSETS, base, p)),
+    yogaWasm,
+    resvgWasm,
+    force: true,
+  })
+})