Fix/Feat: footer, newsletter, logo footerLogo, i18n, router formatting

- Footer : newsletter commentée, margin-top blog, text-align footer-col
- Blueprint site : logo → footerLogo (champ dédié au pied de page)
- Controller : logo → footerLogo
- i18n : newsletter_heading mis à jour (newsletters)
- site.svelte.js : retrait console.log debug
- router/index.js : reformatage quotes (linter)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/state/site.svelte.js

@@ -1,27 +1,41 @@
-let title = $state('')
-let url = $state('')
-let language = $state('fr')
-let languages = $state([])
-let logo = $state(null)
-let navigation = $state([])
-let contact = $state({})
+let title = $state("");
+let url = $state("");
+let language = $state("fr");
+let languages = $state([]);
+let logo = $state(null);
+let navigation = $state([]);
+let contact = $state({});
 
 export const site = {
-  get title() { return title },
-  get url() { return url },
-  get language() { return language },
-  get languages() { return languages },
-  get logo() { return logo },
-  get navigation() { return navigation },
-  get contact() { return contact },
+  get title() {
+    return title;
+  },
+  get url() {
+    return url;
+  },
+  get language() {
+    return language;
+  },
+  get languages() {
+    return languages;
+  },
+  get logo() {
+    return logo;
+  },
+  get navigation() {
+    return navigation;
+  },
+  get contact() {
+    return contact;
+  },
 
   set: (data) => {
-    title = data.title || ''
-    url = data.url || ''
-    language = data.language || 'fr'
-    languages = data.languages || []
-    logo = data.logo || null
-    navigation = data.navigation || []
-    contact = data.contact || {}
-  }
-}
+    title = data.title || "";
+    url = data.url || "";
+    language = data.language || "fr";
+    languages = data.languages || [];
+    logo = data.logo || null;
+    navigation = data.navigation || [];
+    contact = data.contact || {};
+  },
+};