fix(release): republish @mosaicstack/db 0.0.4 with BacklogService; mosaic 0.0.47

mosaic 0.0.46 ships a fleet-backlog command that bare-imports
{ BacklogService, DEFAULT_CLAIM_TTL_SECONDS } from @mosaicstack/db, but
db's version was never bumped after #657 added backlog.ts. The publish
pipeline tolerates "version already exists", so db's new code was never
republished — the registry's db@0.0.3 is the stale pre-#657 artifact with
no BacklogService export. mosaic 0.0.46 (workspace:* -> 0.0.3) therefore
installs the stale db and crashes at CLI entry on every command:

  SyntaxError: The requested module '@mosaicstack/db' does not provide
  an export named 'BacklogService'  (dist/commands/fleet-backlog.js:19)

Verified from registry tarballs: mosaic@0.0.46 declares db as a regular
(non-bundled) dependency at 0.0.3; db@0.0.3 dist exports no BacklogService.
A mosaic-only republish would re-pin 0.0.3 and crash identically, so the
db version bump is mandatory.

Fix: bump @mosaicstack/db 0.0.3 -> 0.0.4 (forces republish WITH
BacklogService past the version-exists gate) and bump mosaic 0.0.46 ->
0.0.47 so workspace:* resolves to db@0.0.4 at publish. pnpm-lock.yaml is
unchanged (workspace deps link by path, not version).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/mosaic/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mosaicstack/mosaic",
-  "version": "0.0.46",
+  "version": "0.0.47",
   "repository": {
     "type": "git",
     "url": "https://git.mosaicstack.dev/mosaicstack/stack.git",