feat(authz): reach the merged catalog from boot via a process-wide singleton

Fix round 1 for Task 14 — closes the gap flagged in the last report:
loadAppAuthzCatalog existed but nothing called it.

- packages/authz/src/client.ts (new): setAuthzCatalog/getAuthzCatalog/
  hasAuthzCatalog, mirroring @wrnexus/db's client.ts. App middleware runs
  at module-eval time and needs the catalog then, so ctx cannot carry it;
  getAuthzCatalog() throws a setup error naming the fix, like getDb() does.
  Exported from packages/authz/src/index.ts.
- packages/dev-server/src/index.ts: startServer calls loadAppAuthzCatalog +
  setAuthzCatalog before middleware is resolved (schemasJs precedent),
  and populates the new RuntimeDeps.authz field.
- packages/dev-server/src/runtime.ts: RuntimeDeps gains authz?: AuthzCatalog.
- packages/cli/src/build.ts: emits static imports of each app/authz/*.ts
  file into the generated entry (components/layouts precedent) and passes
  { source, module } pairs through ProdOptions.authz — the catalog holds
  policy functions, so it cannot be JSON-baked like schemasJs.
- packages/dev-server/src/prod.ts: createProductionHandlers merges those
  declarations and calls setAuthzCatalog before the server accepts
  traffic, so a conflict fails the boot instead of surfacing on the first
  request. Runs for every deployment adapter, not only Bun.serve.

The framework never installs authzMiddleware itself; the app still
registers it with its own store.

Verified end-to-end: added a temporary app/authz declaration to
examples/basic-app, ran `bun run build`, inspected the generated entry's
static import + authz array, and booted dist/server.js to confirm the
merge/setAuthzCatalog call succeeds against real bundled code (reverted
before commit).

packages/authz/src/index.ts

@@ -143,6 +143,7 @@ export type { AuthorizationDecision, DecisionPolicy } from "./advanced.ts";
 export { defineAuthz } from "./registry.ts";
 export { mergeCatalogs, emptyCatalog } from "./catalog.ts";
 export type { CatalogSource } from "./catalog.ts";
+export { setAuthzCatalog, getAuthzCatalog, hasAuthzCatalog } from "./client.ts";
 export { memoryPermissionStore, cachedPermissionStore, scopeKey } from "./store.ts";
 export type { PermissionStore, CachedPermissionStore, CacheOptions, GrantEffect } from "./store.ts";
 export { memoryAuditSink, consoleAuditSink, safeRecord } from "./audit.ts";