feat(admin): display running version in footer and /health

Inline package.json version at bundle time via src/config/version.ts
(resolveJsonModule), surface it in the shared admin/status footer and
add it to the /health JSON so self-hosters can tell which build runs.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

tsconfig.json

@@ -4,6 +4,7 @@
     "module": "ESNext",
     "moduleResolution": "bundler",
     "esModuleInterop": true,
+    "resolveJsonModule": true,
     "strict": true,
     "lib": ["ES2021"],
     "types": ["@cloudflare/workers-types"],