feat(vuetifyx): add VXTimeline, VXVideo, VXTiltedImages, VXImageGallery components

[eideroliveira]

Summary

Four new reusable Vue components with Go server-side builders:

• VXTimeline: Vertical timeline with scroll-driven parallax animations, configurable dot colors, and responsive layout
• VXVideo: HLS.js-powered video player with poster support, play overlay, and rounded corners
• VXTiltedImages: CSS 3D perspective tilt effect for image showcases
• VXImageGallery: Simple responsive image gallery grid

Each component includes a Go builder (vx-*.go) for server-side rendering via htmlgo and is registered in the vuetifyx plugin.

Notes

• VXVideo requires adding hls.js to package.json dependencies
• JS build artifacts are not included — they need to be rebuilt after merging

Test plan

• All four components render correctly in production use
• VXTimeline parallax animation works on scroll without performance issues (uses scroll events, not rAF loop)
• VXVideo plays HLS streams and falls back to native video for non-HLS sources
• TiltedImages 3D effect responds to mouse movement
• ImageGallery displays responsive grid layout