feat: add Udemy courses and fix footer i18n + golangci-lint errors

- Add 5 Udemy courses with PDF certificate links (Go, Fyne, HTMX)
- Fix cv-footer.html to use CV data instead of hardcoded values
- Add i18n labels for footer (linkedin, github, domestika, email, phone)
- Fix 11 golangci-lint errors:
  - errcheck: proper Close() error handling in email/security/tests
  - staticcheck: simplify return and merge variable declaration
  - unused: remove legacy sendEmail and formatMessage functions

data/cv-en.json

@@ -736,6 +736,23 @@
       ],
       "courseID": "codecademy-certifications"
     },
+    {
+      "title": "Udemy Certifications",
+      "institution": "Udemy",
+      "courseLogo": "udemy.png",
+      "location": "Online",
+      "date": "2024-2025",
+      "duration": "Various",
+      "shortDescription": "Professional development courses in Go programming and modern web technologies through Udemy's comprehensive learning platform.",
+      "responsibilities": [
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Go - The Complete Guide.pdf' target='_blank'>Go - The Complete Guide</a></strong> <em>2024</em>: Comprehensive Go programming course covering fundamentals, concurrency, testing, and building production-ready applications</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Building a module in Go.pdf' target='_blank'>Building a Module in Go</a></strong> <em>2024</em>: Deep dive into Go modules, dependency management, versioning, and creating reusable packages</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Up and Running with Concurrency in Go.pdf' target='_blank'>Up and Running with Concurrency in Go</a></strong> <em>2024</em>: Advanced Go concurrency patterns including goroutines, channels, mutexes, and building concurrent applications</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Building GUI Applications with Fyne and Go.pdf' target='_blank'>Building GUI Applications with Fyne and Go</a></strong> <em>2024</em>: Desktop application development using the Fyne toolkit, creating cross-platform GUI applications with Go</div>",
+        "<iconify-icon icon='simple-icons:htmx' width='60' height='60' class='default-company-icon' style='color: #3366CC;'></iconify-icon><div><strong><a href='/static/pdf/udemy/HTMX - The Practical Guide.pdf' target='_blank'>HTMX - The Practical Guide</a></strong> <em>2024</em>: Modern web development with HTMX, building dynamic web applications with minimal JavaScript using hypermedia patterns</div>"
+      ],
+      "courseID": "udemy-certifications"
+    },
     {
       "title": "LinkedIn Learning Certifications",
       "institution": "LinkedIn Learning",

data/cv-es.json

@@ -741,6 +741,23 @@
       ],
       "courseID": "certificaciones-codecademy"
     },
+    {
+      "title": "Certificaciones Udemy",
+      "institution": "Udemy",
+      "courseLogo": "udemy.png",
+      "location": "Online",
+      "date": "2024-2025",
+      "duration": "Varios",
+      "shortDescription": "Cursos de desarrollo profesional en programación Go y tecnologías web modernas a través de la plataforma de aprendizaje integral de Udemy.",
+      "responsibilities": [
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Go - The Complete Guide.pdf' target='_blank'>Go - The Complete Guide</a></strong> <em>2024</em>: Curso completo de programación Go cubriendo fundamentos, concurrencia, testing y construcción de aplicaciones listas para producción</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Building a module in Go.pdf' target='_blank'>Building a Module in Go</a></strong> <em>2024</em>: Profundización en módulos Go, gestión de dependencias, versionado y creación de paquetes reutilizables</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Up and Running with Concurrency in Go.pdf' target='_blank'>Up and Running with Concurrency in Go</a></strong> <em>2024</em>: Patrones avanzados de concurrencia en Go incluyendo goroutines, channels, mutexes y construcción de aplicaciones concurrentes</div>",
+        "<iconify-icon icon='simple-icons:go' width='60' height='60' class='default-company-icon' style='color: #00ADD8;'></iconify-icon><div><strong><a href='/static/pdf/udemy/Building GUI Applications with Fyne and Go.pdf' target='_blank'>Building GUI Applications with Fyne and Go</a></strong> <em>2024</em>: Desarrollo de aplicaciones de escritorio usando el toolkit Fyne, creando aplicaciones GUI multiplataforma con Go</div>",
+        "<iconify-icon icon='simple-icons:htmx' width='60' height='60' class='default-company-icon' style='color: #3366CC;'></iconify-icon><div><strong><a href='/static/pdf/udemy/HTMX - The Practical Guide.pdf' target='_blank'>HTMX - The Practical Guide</a></strong> <em>2024</em>: Desarrollo web moderno con HTMX, construyendo aplicaciones web dinámicas con JavaScript mínimo usando patrones hypermedia</div>"
+      ],
+      "courseID": "certificaciones-udemy"
+    },
     {
       "title": "Certificaciones LinkedIn Learning",
       "institution": "LinkedIn Learning",

data/ui-en.json

@@ -36,7 +36,12 @@
   },
   "footer": {
     "viewOnGithub": "View this project on GitHub",
-    "lastUpdated": "Last updated"
+    "lastUpdated": "Last updated",
+    "linkedin": "linkedin_",
+    "github": "github_",
+    "domestika": "domestika_",
+    "email": "email@",
+    "phone": "phone#"
   },
   "portfolio": {
     "seeAllProjects": "See all projects on my",

data/ui-es.json

@@ -36,7 +36,12 @@
   },
   "footer": {
     "viewOnGithub": "Ver este proyecto en GitHub",
-    "lastUpdated": "Última actualización"
+    "lastUpdated": "Última actualización",
+    "linkedin": "linkedin_",
+    "github": "github_",
+    "domestika": "domestika_",
+    "email": "email@",
+    "phone": "teléfono#"
   },
   "portfolio": {
     "seeAllProjects": "Ver todos los proyectos en mi",