fix(ci): build @docmost/token-estimate before its non-nx consumers (#490)

The shared @docmost/token-estimate package (main: ./dist/index.js, dist/
gitignored) was never built in the CI jobs that bypass nx, so develop CI
went red:
- test.yml `test` (pnpm -r test): client vitest failed to resolve the import.
- develop.yml `e2e-server` (direct jest e2e): server history-budget.ts hit
  TS2307 Cannot find module '@docmost/token-estimate'.
The nx-driven jobs (build, e2e-mcp) stayed green via dependsOn: ^build.

- test.yml: add "Build token-estimate" step to the `test` job.
- develop.yml: add "Build token-estimate" step to the `e2e-server` job.
- Dockerfile: ship packages/token-estimate/dist + package.json into the
  installer stage — apps/server depends on it (workspace:*) and imports it
  at runtime, so the prod image would otherwise crash with
  ERR_MODULE_NOT_FOUND (masked so far because publish/smoke never ran).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/workflows/test.yml

@@ -159,6 +159,14 @@ jobs:
       - name: Build prosemirror-markdown
         run: pnpm --filter @docmost/prosemirror-markdown build
 
+      # @docmost/token-estimate is a shared workspace package the client vitest
+      # suite resolves via its dist build (main: ./dist/index.js); dist/ is
+      # gitignored and `pnpm -r test` does NOT honour nx `dependsOn: ^build`, so
+      # build it before the recursive test run or the client suite fails with
+      # "Failed to resolve import '@docmost/token-estimate'" (#490).
+      - name: Build token-estimate
+        run: pnpm --filter @docmost/token-estimate build
+
       - name: Run unit tests
         run: pnpm -r test