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-en.json

@@ -121,6 +121,10 @@
       },
       "actions": {
         "title": "Actions",
+        "cmdK": {
+          "key": "⌘/Ctrl K",
+          "description": "Open command bar"
+        },
         "print": {
           "key": "Ctrl / Cmd + P",
           "description": "Print or save as PDF"
@@ -187,6 +191,38 @@
       "title": "Error"
     }
   },
+  "cmdK": {
+    "placeholder": "Type a command or search...",
+    "noResults": "No results found",
+    "sections": {
+      "navigation": "Navigation",
+      "shortcuts": "Shortcuts",
+      "downloads": "Downloads"
+    },
+    "actions": {
+      "jumpToExperience": "Jump to Experience",
+      "jumpToEducation": "Jump to Education",
+      "jumpToSkills": "Jump to Skills",
+      "jumpToProjects": "Jump to Projects",
+      "jumpToCourses": "Jump to Courses",
+      "jumpToLanguages": "Jump to Languages",
+      "jumpToAwards": "Jump to Awards",
+      "toggleLength": "Toggle CV Length",
+      "toggleIcons": "Toggle Icons",
+      "toggleTheme": "Toggle Theme",
+      "showShortcuts": "Show Keyboard Shortcuts",
+      "print": "Print CV",
+      "downloadPdfShort": "Download PDF (Short)",
+      "downloadPdfDefault": "Download PDF (Default)",
+      "downloadPdfExtended": "Download PDF (Extended)",
+      "viewTextCv": "View Text CV",
+      "downloadTextCv": "Download Text CV"
+    },
+    "button": {
+      "tooltip": "Command Bar",
+      "ariaLabel": "Open command bar (Cmd+K)"
+    }
+  },
   "widgets": {
     "backToTop": {
       "ariaLabel": "Back to top",
@@ -232,7 +268,9 @@
       "downloadPdf": "Download as PDF",
       "printFriendly": "Print Friendly",
       "plainText": "Plain Text",
-      "contact": "Contact"
+      "contact": "Contact",
+      "search": "Search",
+      "searchAriaLabel": "Open command bar (Cmd+K)"
     }
   }
 }