feat(ui): projects index page through registerPage (M4 slice 1)

[gdarko]

The first UI slice of the module (M4, slice 1). The sidebar entry already
points at /admin/modules/tasks-projects; until now that landed on the host's
404 view. It now lands on a real projects index.

What is in it

• resources/js/api.ts + resources/js/types/ - endpoint constants and
  thin typed functions over the injected axios client for projects (list with
  page, limit, status, search; create; update; archive; unarchive;
  delete), members, settings, and the host customer list the form reads.
• pages/ProjectsIndexPage.vue - BasePage + BasePageHeader with a Home
  to Projects breadcrumb, a filter toggle and a New project button; a
  BaseFilterWrapper whose search input is debounced into a server-side
  BaseTable fetcher, with a status filter of Active / Archived / All; columns
  for name (colour swatch and identifier), status, customer, rate per hour and
  due date, and an actions dropdown for edit, archive/restore and delete
  (window.confirm for now). BaseEmptyPlaceholder when a company has no
  projects at all.
• components/ProjectFormModal.vue - create and edit in one BaseModal.
  Rates are typed in major units and stored as minor units, budgets are typed
  in hours and stored as minutes, and 422 errors land under their fields
  through BaseInputGroup.
• init.ts - registers the English bundle and the page through
  extensions.registerPage, behind tasks-projects:view-project. The page
  receives the host client, notifier and router as props, since a module bundle
  shares the host's Vue instance but not its Pinia or router injections.
• Backend - ProjectService::create and update now default a project's
  currency_id from its customer through CompanyDataReader::findCustomer.
  A currency the caller names wins, and an explicit null still clears it.

Checks

pnpm run lint, pnpm exec tsc --noEmit, pnpm run build (with dist/
committed), composer run lint, composer run test (229 tests, 889
assertions, 6 of them new), validate-module and validate-package.

Driven in the running dev stack with Playwright: the sidebar link lands on the
page, a project created through the modal appears in the table, search and the
status filter narrow the list, and archive, restore and delete all round-trip.
The console stays clean.

Notes and follow-ups

• The customer column shows customer_id for now; the name lookup is a later
  slice, as is the project detail page the router prop is there for.
• The list endpoint has no sort parameter, so every column is declared
  unsortable rather than offering a control that does nothing.
• The status badge overrides the host BaseBadge colours with ! utilities:
  the host stylesheet is injected a second time after the module's, so an
  unimportant token class loses to the badge's built-in colour.

https://claude.ai/code/session_01DCf36XDKprZifej8dc2r1E

[gdarko]

Superseded by #14, which carries this stack consolidated into three commits on top of main.