feat: add comprehensive testing infrastructure and security hardening

- Enhanced CI/CD pipeline with coverage reporting, benchmarks, and artifact uploads
- Implemented rate limiter IP validation with proxy support and spoofing protection
- Added extensive Makefile test targets for coverage, benchmarks, and continuous testing
- Expanded middleware chain with request validation, size limits, and suspicious activity logging

testdata/ui-test-es.json

@@ -0,0 +1,35 @@
+{
+  "language_name": "Español",
+  "language_code": "es",
+  "sections": {
+    "experience": "Experiencia",
+    "education": "Educación",
+    "skills": "Habilidades",
+    "projects": "Proyectos",
+    "certifications": "Certificaciones",
+    "about": "Acerca de"
+  },
+  "labels": {
+    "present": "Presente",
+    "location": "Ubicación",
+    "download_pdf": "Descargar PDF",
+    "view_on_github": "Ver en GitHub",
+    "email": "Correo",
+    "phone": "Teléfono",
+    "website": "Sitio web",
+    "technologies": "Tecnologías",
+    "tools": "Herramientas",
+    "languages": "Idiomas"
+  },
+  "actions": {
+    "print": "Imprimir",
+    "download": "Descargar",
+    "share": "Compartir",
+    "close": "Cerrar"
+  },
+  "messages": {
+    "loading": "Cargando...",
+    "error": "Error al cargar datos",
+    "not_found": "Página no encontrada"
+  }
+}