feat: Add CMD+K command palette with ninja-keys integration

Implement a command palette accessible via CMD+K/Ctrl+K using the ninja-keys
web component. Features include:

- New /api/cmd-k endpoint serving dynamic CV entries (experiences, projects, courses)
- Language-aware responses with 1-hour cache headers
- Scroll-to-section functionality for quick navigation
- Enhanced keyboard shortcuts modal with CMD+K documentation
- Comprehensive test coverage for API and UI interactions

Also includes cleanup of deprecated debug test files and various UI polish
improvements to contact form, themes, and action bar components.

data/ui-es.json

@@ -121,6 +121,10 @@
       },
       "actions": {
         "title": "Acciones",
+        "cmdK": {
+          "key": "⌘/Ctrl K",
+          "description": "Abrir barra de comandos"
+        },
         "print": {
           "key": "Ctrl / Cmd + P",
           "description": "Imprimir o guardar como PDF"
@@ -187,6 +191,38 @@
       "title": "Error"
     }
   },
+  "cmdK": {
+    "placeholder": "Escribe un comando o busca...",
+    "noResults": "No se encontraron resultados",
+    "sections": {
+      "navigation": "Navegación",
+      "shortcuts": "Atajos",
+      "downloads": "Descargas"
+    },
+    "actions": {
+      "jumpToExperience": "Ir a Experiencia",
+      "jumpToEducation": "Ir a Educación",
+      "jumpToSkills": "Ir a Habilidades",
+      "jumpToProjects": "Ir a Proyectos",
+      "jumpToCourses": "Ir a Cursos",
+      "jumpToLanguages": "Ir a Idiomas",
+      "jumpToAwards": "Ir a Premios",
+      "toggleLength": "Alternar Longitud del CV",
+      "toggleIcons": "Alternar Iconos",
+      "toggleTheme": "Alternar Tema",
+      "showShortcuts": "Mostrar Atajos de Teclado",
+      "print": "Imprimir CV",
+      "downloadPdfShort": "Descargar PDF (Corto)",
+      "downloadPdfDefault": "Descargar PDF (Por Defecto)",
+      "downloadPdfExtended": "Descargar PDF (Extendido)",
+      "viewTextCv": "Ver CV en Texto",
+      "downloadTextCv": "Descargar CV en Texto"
+    },
+    "button": {
+      "tooltip": "Barra de Comandos",
+      "ariaLabel": "Abrir barra de comandos (Cmd+K)"
+    }
+  },
   "widgets": {
     "backToTop": {
       "ariaLabel": "Volver arriba",
@@ -232,7 +268,9 @@
       "downloadPdf": "Descargar como PDF",
       "printFriendly": "Imprimir amigable",
       "plainText": "Texto Plano",
-      "contact": "Contacto"
+      "contact": "Contacto",
+      "search": "Buscar",
+      "searchAriaLabel": "Abrir barra de comandos (Cmd+K)"
     }
   }
 }