feat(portal-shell): replace nx-welcome with real shell and home + budgets per ADR-0017 (#74)

## Summary

Cuts the Nx scaffold's `NxWelcome` page (938 LOC of placeholder markup) and lays down the actual portal layout — header, main, footer landmarks plus a skip link — with a real home page and the two RGAA-mandated accessibility statement routes. Bundle budgets in `project.json` are tightened to match ADR-0017.

## What lands

**Layout shell** (`apps/portal-shell/src/app/`):

- `components/header/` — brand link + primary nav landmark stub
- `components/footer/` — accessibility statement links (FR + EN) + version badge
- `app.html` / `app.scss` — flex column with sticky footer + skip link to `#main-content` (WCAG 2.4.1)

**Pages**:

- `pages/home/` — welcome heading + "system status" widget that fetches `/api/health` from the BFF. Doubles as a smoke test of the full SPA → BFF stack: CORS, OTel trace propagation, Pino log correlation. After page load, http://localhost:16686 should show one trace whose root span is the SPA `document_load`, with a child `fetch` span that has its own child `HTTP GET /api/health` BFF span.
- `pages/accessibility/` — single component, content selected by route data (`lang: 'fr' | 'en'`). Mounted at `/accessibility` (en) and `/accessibilite` (fr). v1 carries placeholder copy explicitly framed as "awaiting APF user panel review" — RGAA + ADR-0016 require the routes to exist; the substantive statement (audit grid, gaps list, remediation plan) lands separately.

**Routing & wiring**:

- `app.routes.ts` adds the three routes, all lazy-loaded.
- `app.config.ts` adds `provideHttpClient(withFetch())` so HttpClient delegates to the patched browser `fetch` and the W3C `traceparent` header propagates automatically (per ADR-0012 phase 2).
- `nx-welcome.ts` removed; `app.ts` no longer imports it.

**Bundle budgets** (`apps/portal-shell/project.json`):

| Type                | Limit (raw)  | ADR-0017 (gzip) |
| ------------------- | ------------ | --------------- |
| `initial`           | 1 MB         | ≤ 300 KB        |
| `anyScript`         | 300 KB       | ≤ 100 KB / chunk |
| `anyComponentStyle` | 6 KB         | ≤ 6 KB           |
| `bundle "styles"`   | 150 KB       | ≤ 150 KB         |

`maximumWarning == maximumError` so an overshoot fails the build (matching `type: "error"` in spirit). Angular CLI compares **raw** sizes; ADR-0017 §Confirmation is updated to record the gzip→raw translation and the deferred follow-up that will add a CI check on the actual gzipped transfer size (Angular has no native gzip-mode budget).

## Verified locally

- `pnpm exec nx run-many -t lint test build` → 8 projects green; **12 tests pass** for `portal-shell` across 5 specs (App, Header, Footer, Home, AccessibilityStatement).
- `pnpm nx build portal-shell --configuration=production` → initial bundle **326.99 KB raw / 89.82 KB transfer** (gzip) — well under the ADR-0017 300 KB gzip target. Lazy chunks: home 2.66 KB, accessibility 2.90 KB.
- `pnpm audit` clean.

After `./infra/local/dev.sh up observability` + `pnpm nx serve portal-bff` + `pnpm nx serve portal-shell`, opening http://localhost:4200 shows the new layout, the system-status widget connects to the BFF, and the corresponding trace appears in Jaeger.

## Out of scope (separate PRs)

- **Real RGAA audit content** — APF user-panel review.
- **Design tokens system** in `libs/shared/tokens`.
- **Reusable UI primitives** in `libs/shared/ui`.
- **User-preferences panel** (ADR-0016 §"User-preferences panel").
- **i18n machinery** (`@angular/localize`) — for v1 the FR/EN copy is inlined and route-driven; real i18n is a separate ADR.
- **Env-config** (Angular `environment.ts`) — the hard-coded `http://localhost:3000/api/health` will move there alongside the OTLP endpoint when the env-config PR lands.
- **CI gzip-transfer-size assertion** to complement the raw-size Angular budgets.

## Test plan

- [ ] CI green on this PR.
- [ ] Local: home page renders, system-status widget transitions from "Checking the backend…" to the success state when the BFF is up; falls back to "Backend unreachable" with the BFF stopped.
- [ ] `/accessibility` and `/accessibilite` render the matching language with `<article lang="en|fr">`.
- [ ] Skip link reachable via Tab from address bar; clicking it focuses `#main-content`.
- [ ] Production build size summary roughly matches the figures above (initial total ≈ 90 KB transfer).

---------

Co-authored-by: Julien Gautier <julien.gautier@apf.asso.fr>
Reviewed-on: #74

apps/portal-shell/project.json

@@ -27,13 +27,24 @@
           "budgets": [
             {
               "type": "initial",
-              "maximumWarning": "500kb",
+              "maximumWarning": "1mb",
               "maximumError": "1mb"
             },
+            {
+              "type": "anyScript",
+              "maximumWarning": "300kb",
+              "maximumError": "300kb"
+            },
             {
               "type": "anyComponentStyle",
-              "maximumWarning": "4kb",
-              "maximumError": "8kb"
+              "maximumWarning": "5kb",
+              "maximumError": "6kb"
+            },
+            {
+              "type": "bundle",
+              "name": "styles",
+              "maximumWarning": "150kb",
+              "maximumError": "150kb"
             }
           ],
           "outputHashing": "all"