docs(agent): refresh architecture/CLAUDE.md docs for Payload CMS (MITHOME-95)

The Content layer description across the AI-agent steering docs still
described the pre-migration JSON system as the live, current mechanism
— rule #1 in CLAUDE.md and the Content row in architecture.md
explicitly told future work (and future agent sessions) to edit
proto/src/content/pages/*.json directly, which the live site hasn't
read since MITHOME-91.

Rewrote, per the ticket's named targets:
- .agent/steering/architecture.md: system overview, the Content layer
  table row, rule #1, and the Content Management code example now
  describe Payload Globals/Collections + the payload-content.ts Local
  API adapter, with /admin as the editing surface.
- CLAUDE.md: Stack line now names Payload CMS, rule #1 rewritten the
  same way, and the project-structure tree gets the (frontend)/(payload)
  route groups, globals/, collections/, and payload.config.ts that were
  entirely missing from it.

Also fixed directly-adjacent staleness found while doing this pass —
same "how is content edited" documentation debt, just not literally
named in the ticket:
- .agent/AGENTS.md: same project-structure tree gap as CLAUDE.md.
- .agent/workflows/new-feature.md: step 3 told contributors to edit
  the JSON file directly; now points at the Payload config + admin.
- .agent/workflows/review.md: the example "flag hardcoded text" review
  comment suggested moving it into the JSON file.
- .agent/steering/development-rules.md: the TRADEOFF code example
  literally used "JSON content management vs CMS" as a live open
  decision — that decision is resolved, updated the example to match.
- README.md: the entire "Tartalomkezelés" section and a "CMS
  Publikálás gomb" paragraph described the retired content-editor.js
  workflow (git-push-based publish, JSON directory tour) as current;
  also dropped a dead link to docs/felhasznaloi-utmutato.md, deleted
  in MITHOME-93.

Doc-only change, no proto/ source touched — no gate to run beyond a
sanity re-read of each edited file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CLAUDE.md

@@ -10,14 +10,14 @@
 
 - **Projekt**: mozdIT Bt. weboldal (websitedev)
 - **Plane workspace**: `developments` — `pm.llmdev.mozdit.hu`
-- **Stack**: Next.js 15, React 19, TypeScript, Tailwind CSS 4, MongoDB, Winston
+- **Stack**: Next.js 15, React 19, TypeScript, Tailwind CSS 4, Payload CMS (self-hosted, `/admin`), MongoDB, Winston
 - **Fő könyvtár**: `proto/` — **minden parancsot innen futtatunk**
 
 ---
 
 ## Gyors referencia — Alapszabályok
 
-1. **Szöveg sosem kerülhet közvetlenül komponensbe** → `proto/src/content/pages/*.json`
+1. **Szöveg sosem kerülhet közvetlenül komponensbe** → Payload CMS Global/Collection mező (admin: `/admin`), a frontend `proto/src/lib/payload-content.ts`-en át olvassa. (`proto/src/content/pages/*.json` már csak a migrációs seed-script forrása + teszt-fixture, élő oldal nem használja — MITHOME-91/93/96.)
 2. **Feladatok**: `TODO.md` (Plane tükörképe), szinkron: `node plane-sync.js`
 3. **Tesztek**: minden feature-höz kötelező; commit előtt `npm test` zöld
 4. **Commit**: Conventional Commits (`feat:`, `fix:`, `docs:`, `chore:`)
@@ -47,12 +47,17 @@ node plane-sync.js          # Plane szinkronizáció
 websitedev/
 ├── proto/                      # Fő Next.js alkalmazás
 │   └── src/
-│       ├── app/                # App Router: oldalak és API route-ok
+│       ├── app/
+│       │   ├── (frontend)/     # Publikus oldalak: [locale]/[slug] catch-all
+│       │   └── (payload)/      # Payload admin (/admin) + REST/GraphQL API
 │       ├── components/         # React komponensek (PascalCase.tsx)
-│       ├── content/            # JSON tartalom-kezelő rendszer
-│       │   ├── common.json     # Közös szövegek
-│       │   └── pages/          # Oldal-specifikus JSONok
-│       ├── lib/                # MongoDB, Logger, Site Config
+│       ├── globals/            # Payload Globals (Home, About, Services, Contact, Common)
+│       ├── collections/        # Payload Collections (LegalPages, Partners, Media, ContactSubmissions, Users)
+│       ├── payload.config.ts   # Payload CMS konfiguráció
+│       ├── content/            # RÉGI JSON rendszer — csak migrációs seed + teszt-fixture (MITHOME-91/93/96)
+│       │   ├── common.json
+│       │   └── pages/
+│       ├── lib/                # payload-content.ts (Local API adapter), MongoDB health-check, Logger
 │       ├── config/             # Statikus site konfiguráció
 │       └── types/              # TypeScript típusok
 ├── docs/                       # Projekt dokumentáció (Magyar)
@@ -77,6 +82,7 @@ Szükséges változók (`.env` és `proto/.env.local`):
 - `NEXT_PUBLIC_CONTACT_EMAIL` — Kapcsolati email cím
 - `PLANE_API_KEY` — Plane szinkronizációhoz (a `.mcp.json`-ban is lehet)
 - `PAYLOAD_SECRET` — Payload CMS JWT/session aláíráshoz (MITHOME-86); környezetenként egyedi, erős érték
+- `ADMIN_EMAIL` / `ADMIN_PASSWORD` — staging/production: `deploy.sh` ezekkel hoz létre egy ismert admin usert egy vadonatúj adatbázison (MITHOME-97 follow-up), csak akkor, ha a `users` collection még üres
 
 ---