effect: introduce defineService and drop per-call Effect.provide

Wave A migrated TuiConfig/Installation callers to
`AppRuntime.runPromise(svc.use(fn).pipe(Effect.provide(svc.layer)))`,
which couples every call site to the service's layer construction.

`defineService(Service, layer)` composes `makeRuntime` on top of an
existing service so the service exposes its own runPromise/runFork/etc.
Each per-service runtime shares the global memoMap, so dependencies are
still built once.

Call sites collapse from:
  await AppRuntime.runPromise(
    TuiConfig.Service.use((svc) => svc.get()).pipe(Effect.provide(TuiConfig.layer)),
  )
to:
  await TuiConfig.runPromise((svc) => svc.get())

Same shape applied to Installation. No per-method async wrappers.