[FEAT] PWA installabile Android/iOS conforme AGID (v1.15.0)

- manifest.webmanifest + service worker (offline shell, /api network-only, asset stale-while-revalidate)
- set icone (192/512 + maskable + apple-touch + favicon), generate zero-deps (pure Node+zlib)
- tag PWA + viewport viewport-fit=cover (zoom mantenuto, WCAG 1.4.4) in 77 pagine HTML
- AGID/WCAG 2.1 AA: touch target >=44px, orientamento/zoom liberi, safe-area standalone
- generatori riproducibili: scripts/gen-pwa-icons.mjs + scripts/inject-pwa-head.mjs
- bump version 1.14.1 -> 1.15.0

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

public/manifest.webmanifest

@@ -0,0 +1,59 @@
+{
+  "name": "NIS2 Agile — Compliance NIS2 & D.Lgs. 138/2024",
+  "short_name": "NIS2 Agile",
+  "description": "Piattaforma per la conformità alla direttiva NIS2 e al D.Lgs. 138/2024.",
+  "lang": "it",
+  "dir": "ltr",
+  "start_url": "/dashboard.html?source=pwa",
+  "scope": "/",
+  "display": "standalone",
+  "display_override": ["standalone", "minimal-ui"],
+  "orientation": "any",
+  "theme_color": "#0066CC",
+  "background_color": "#FFFFFF",
+  "categories": ["business", "productivity", "security"],
+  "icons": [
+    {
+      "src": "/assets/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/assets/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/assets/icons/icon-192-maskable.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/assets/icons/icon-512-maskable.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Dashboard",
+      "short_name": "Dashboard",
+      "url": "/dashboard.html?source=pwa",
+      "icons": [
+        { "src": "/assets/icons/icon-192.png", "sizes": "192x192", "type": "image/png" }
+      ]
+    },
+    {
+      "name": "Incidenti Art.23",
+      "short_name": "Incidenti",
+      "url": "/incidents.html?source=pwa",
+      "icons": [
+        { "src": "/assets/icons/icon-192.png", "sizes": "192x192", "type": "image/png" }
+      ]
+    }
+  ]
+}