feat(seo): add SEO tabs to all page blueprints

Add seo: seo/page tab to all page blueprints ensuring each page has
at minimum contentTab and seo tabs (plus metadata where applicable).

Pages updated:
- Simple pages converted to tabs structure: home, about, resources
- Default page converted to tabs structure
- Pages with existing tabs: shop, product, support, folder, folders,
  investigations, impact, impacts, report, investigation-summary

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

site/blueprints/pages/about.yml

@@ -1 +1,7 @@
 title: À propos
+
+tabs:
+  contentTab:
+    label: Contenu
+    icon: page
+  seo: seo/page

site/blueprints/pages/default.yml

@@ -1,5 +1,9 @@
 title: Default Page
 
+tabs:
+  contentTab:
+    label: Contenu
+    icon: page
     columns:
       main:
         width: 2/3
@@ -18,4 +22,4 @@ columns:
             template: default
           files:
             type: files
-
+  seo: seo/page

site/blueprints/pages/folder.yml

@@ -19,3 +19,4 @@ tabs:
           ratio: 12/7
           cover: true
         help: Image utilisée dans la liste des dossiers
+  seo: seo/page

site/blueprints/pages/folders.yml

@@ -15,3 +15,4 @@ tabs:
           cover: true
           ratio: 12/7
         template: folder
+  seo: seo/page

site/blueprints/pages/home.yml

@@ -1 +1,7 @@
 title: Accueil
+
+tabs:
+  contentTab:
+    label: Contenu
+    icon: page
+  seo: seo/page

site/blueprints/pages/impact.yml

@@ -7,3 +7,4 @@ tabs:
       template: investigation-summary
     linkedMedias:
       type: url
+  seo: seo/page

site/blueprints/pages/impacts.yml

@@ -3,4 +3,4 @@ title: Impacts
 tabs:
   contentTab:
     label: Contenu
-  seoTab:
+  seo: seo/page

site/blueprints/pages/investigation-summary.yml

@@ -133,3 +133,4 @@ tabs:
         type: pages
         multiple: true
         query: site.find('enquetes').children
+  seo: seo/page

site/blueprints/pages/investigations.yml

@@ -5,3 +5,4 @@ tabs:
     label: Contenu
     sections:
       investigations: fields/investigations
+  seo: seo/page

site/blueprints/pages/product.yml

@@ -27,3 +27,4 @@ tabs:
             type: entries
             field:
               type: text
+  seo: seo/page

site/blueprints/pages/report.yml

@@ -94,3 +94,4 @@ tabs:
             type: link
             options:
               - url
+  seo: seo/page

site/blueprints/pages/resources.yml

@@ -1 +1,7 @@
 title: Resources
+
+tabs:
+  contentTab:
+    label: Contenu
+    icon: page
+  seo: seo/page

site/blueprints/pages/shop.yml

@@ -8,3 +8,4 @@ tabs:
         type: pages
         template: product
         ratio: 4/3
+  seo: seo/page

site/blueprints/pages/support.yml

@@ -43,3 +43,4 @@ tabs:
               answer:
                 label: Réponse
                 type: text
+  seo: seo/page