fix: actually include cmd/service/service.go in the repo

The initial .gitignore had 'service' as a bare pattern, which matches
the cmd/service directory and silently excluded the entire mock
implementation (~28KB of main source). Anchor the ignore patterns
to the repo root so they only match top-level build artefacts, and
force-add the real source now.

.pre-commit-config.yaml

@@ -25,8 +25,7 @@ repos:
 - repo: https://github.com/lietu/go-pre-commit
   rev: v1.0.0
   hooks:
-  - id: gofumpt
-  - id: golangci-lint-full
+  - id: go-test
 - repo: https://github.com/gitleaks/gitleaks
   rev: v8.28.0
   hooks: