refactor: Extract all hardcoded content to JSON files

- Move all bilingual text from templates to UI JSON (labels, buttons, modals)
- Move skills summary paragraph to CV JSON with HTML support
- Add new UI sections: navigation, viewControls, sections, footer, portfolio,
  pdfModal, shortcutsModal, infoModal, widgets
- Update Go structs to match expanded JSON structure
- Add template.HTML type for CV.SkillsSummary field
- Add JSON content validation test (70-json-content-validation.test.mjs)

Templates now contain only structural logic (CSS classes, HTML attributes)
while all user-visible text loads from JSON files for proper i18n support.

templates/index.html

@@ -5,10 +5,10 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
     <!-- Primary Meta Tags -->
-    <title>{{.CV.Personal.Name}} - {{if eq .Lang "es"}}Curriculum Vitae{{else}}Curriculum Vitae{{end}}</title>
-    <meta name="title" content="{{.CV.Personal.Name}} - {{if eq .Lang "es"}}CV Profesional{{else}}Professional CV{{end}}">
-    <meta name="description" content="{{.CV.Personal.Title}} | {{if eq .Lang "es"}}18 años de experiencia en desarrollo web, SAP CDC, React, Node.js, Go, HTMX y desarrollo asistido por IA{{else}}18 years of experience in web development, SAP CDC, React, Node.js, Go, HTMX and AI-assisted development{{end}}">
-    <meta name="keywords" content="{{if eq .Lang "es"}}CV, Curriculum Vitae, {{.CV.Personal.Name}}, Desarrollador FullStack, SAP CDC, React, Node.js, Go, HTMX, IA, Desarrollo Web, Consultor Técnico{{else}}CV, Resume, {{.CV.Personal.Name}}, FullStack Developer, SAP CDC, React, Node.js, Go, HTMX, AI, Web Development, Technical Consultant{{end}}">
+    <title>{{.CV.Personal.Name}} - {{.CV.SEO.PageTitle}}</title>
+    <meta name="title" content="{{.CV.Personal.Name}} - {{.CV.SEO.MetaTitle}}">
+    <meta name="description" content="{{.CV.Personal.Title}} | {{.CV.SEO.MetaDescription}}">
+    <meta name="keywords" content="{{.CV.Personal.Name}}, {{.CV.SEO.Keywords}}">
     <meta name="author" content="{{.CV.Personal.Name}}">
     <meta name="robots" content="index, follow">
     <link rel="canonical" href="{{.CanonicalURL}}">
@@ -21,18 +21,18 @@
     <!-- Open Graph / Facebook -->
     <meta property="og:type" content="profile">
     <meta property="og:url" content="{{.CV.Personal.Website}}">
-    <meta property="og:title" content="{{.CV.Personal.Name}} - {{if eq .Lang "es"}}CV Profesional{{else}}Professional CV{{end}}">
-    <meta property="og:description" content="{{.CV.Personal.Title}} | {{if eq .Lang "es"}}Consultor Técnico Senior con 18 años de experiencia{{else}}Senior Technical Consultant with 18 years of experience{{end}}">
+    <meta property="og:title" content="{{.CV.Personal.Name}} - {{.CV.SEO.MetaTitle}}">
+    <meta property="og:description" content="{{.CV.Personal.Title}} | {{.CV.SEO.OgDescription}}">
     <meta property="og:image" content="{{.CV.Personal.Website}}/static/images/profile.jpg">
     <meta property="og:locale" content="{{if eq .Lang "es"}}es_ES{{else}}en_US{{end}}">
     <meta property="og:site_name" content="{{.CV.Personal.Name}}">
-    <meta property="profile:first_name" content="Juan Andrés">
-    <meta property="profile:last_name" content="Moreno Rubio">
-    <meta property="profile:username" content="txeo">
+    <meta property="profile:first_name" content="{{.CV.Personal.FirstName}}">
+    <meta property="profile:last_name" content="{{.CV.Personal.LastName}}">
+    <meta property="profile:username" content="{{.CV.Personal.Username}}">
 
     <!-- Social Media Card (Generic) -->
     <meta name="twitter:card" content="summary">
-    <meta name="twitter:title" content="{{.CV.Personal.Name}} - {{if eq .Lang "es"}}CV Profesional{{else}}Professional CV{{end}}">
+    <meta name="twitter:title" content="{{.CV.Personal.Name}} - {{.CV.SEO.MetaTitle}}">
     <meta name="twitter:description" content="{{.CV.Personal.Title}}">
     <meta name="twitter:image" content="{{.CV.Personal.Website}}/static/images/profile.jpg">