feat(commercial) : 2e email de facturation optionnel sur l'adresse client (ERP-119)

Pendant du telephone secondaire (max 2). Bump @malio/layer-ui 1.7.8 (prop
addable du MalioInputEmail).

- back : colonne billing_email_secondary (migration + COMMENT + catalogue),
  propriete ClientAddress (Email + Length), Callback etendu (2e email interdit
  hors facturation, optionnel sinon), normalisation lowercase au Processor.
- front : draft + flag UI hasSecondaryBillingEmail, mappers, payloads, champ
  MalioInputEmail :addable -> revele un 2e champ ; layout : 2e email qui coule
  dans la grille et Adresse complementaire sur une colonne.
- tests back (2 emails / 2e email hors facturation) et front (payload).

frontend/package-lock.json

@@ -7,7 +7,7 @@
       "name": "starseed-frontend",
       "hasInstallScript": true,
       "dependencies": {
-        "@malio/layer-ui": "^1.7.7",
+        "@malio/layer-ui": "^1.7.8",
         "@nuxt/icon": "^2.2.1",
         "@nuxtjs/i18n": "^10.2.3",
         "@nuxtjs/tailwindcss": "^6.14.0",
@@ -1866,9 +1866,9 @@
       "license": "MIT"
     },
     "node_modules/@malio/layer-ui": {
-      "version": "1.7.7",
-      "resolved": "https://gitea.malio.fr/api/packages/MALIO-DEV/npm/%40malio%2Flayer-ui/-/1.7.7/layer-ui-1.7.7.tgz",
-      "integrity": "sha512-MLHDtOzUxcCwIBGWj4FcUMLQTExtGD29uLvpU+IA6qr7gCj9kZ9fGZDu76LXxuJJdfBwzZmenuZioE7Z1qQUUw==",
+      "version": "1.7.8",
+      "resolved": "https://gitea.malio.fr/api/packages/MALIO-DEV/npm/%40malio%2Flayer-ui/-/1.7.8/layer-ui-1.7.8.tgz",
+      "integrity": "sha512-gUMAZzBsPCfQUF3OQSjN/OFzjONvQZYfwqH0u5VUbxaqwBdX1hUGtjD4ym6RvZkyNsKulrxkncFZYTWCS+IdGA==",
       "dependencies": {
         "@nuxt/icon": "^2.2.1",
         "@nuxtjs/tailwindcss": "^6.14.0",