feat(web): hub integrare /integrare — exemple cod + retetar VFP + ping + export (PRD 5.1)

Pagina /integrare (tab autentificat, scoped pe cont): exemple cod multi-limbaj
(curl/Python/PHP/C#/Node) + retetar Visual FoxPro (MSXML2 + WinHttp) pe ambele
canale (prezentari JSON + import fisier), export Postman/OpenAPI/Swagger si buton
"Testeaza conexiunea".

- US-001: GET /v1/ping (readiness: account_id/mediu/autentificat_cu_cheie/
  are_creds_rar/ts) + GET /v1/integrare/postman.json (v2.1.0, allowlist 3 rute)
- US-002: app/web/integrare_examples.py pur (7 limbaje x 2 canale, drift-test
  is_required(), JSON compact pentru C#/VFP)
- US-003: tab "Integrare" IA pe 2 niveluri (limbaj->canal, VFP cu dialecte),
  copy din <pre><code>, empty-state CTA, export .cardlink, script scoped
- US-004: POST /integrare/test-cheie (account_for_key direct, scoped sesiune,
  no-echo cheie)

Backend trimitere (worker/masina stari/idempotenta/mapping) si schema neatinse.
568 teste pass. VERIFY context curat + E2E browser (Playwright) + code-review high.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/main.py

@@ -22,6 +22,7 @@ from starlette.responses import RedirectResponse
 
 from . import __version__
 from .api.v1.import_router import router as import_v1_router
+from .api.v1.integrare_router import router as integrare_v1_router
 from .api.v1.router import router as api_v1_router
 from .config import get_settings
 from .db import get_connection, init_db, queue_depth, read_heartbeat
@@ -90,6 +91,7 @@ app.mount("/static", StaticFiles(directory=str(_STATIC_DIR)), name="static")
 
 app.include_router(api_v1_router)
 app.include_router(import_v1_router)
+app.include_router(integrare_v1_router)
 app.include_router(web_router)
 app.include_router(auth_router)
 app.include_router(admin_router)