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.

templates/partials/sections/courses.html

@@ -12,7 +12,7 @@
                 </h3>
             </summary>
         {{range .CV.Courses}}
-        <div class="course-item">
+        <div class="course-item" id="course-{{.CourseID}}" data-course="{{.CourseID}}" data-title="{{.Title}}" data-institution="{{.Institution}}">
             {{if .CourseLogo}}
             <div class="course-icon">
                 <img src="/static/images/courses/{{.CourseLogo}}" alt="{{.Title}} logo" onerror="this.parentElement.innerHTML='<iconify-icon icon=\'mdi:school\' width=\'80\' height=\'80\' class=\'default-course-icon\'></iconify-icon>'">