Renames the `InjectField` decorator (and its file) to `LazyInject` to
name its one distinguishing property: it resolves on first access, not
eagerly at construction. After migrating the DI-constructed call sites to
`inject()`, every remaining user keeps it deliberately for lazy
resolution — to break a circular dependency, to work on a manually
instantiated class, or to defer a service whose factory needs loaded
configuration. Mechanical rename, no behaviour change.
Alexander Brandon Coles
f7a5725386