Serve the styleguide's images and links locally

The styleguide loaded 42 images from picsum.photos and linked demo items to
daisyui.com. It now uses six small SVG landscapes in wwwroot/imgs/styleguide/
(the diff demo greys one with the grayscale utility), and its demo links stay on
/styleguide.

It also gains a carousel demo with navigation and indicators.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

wwwroot/imgs/styleguide/scene-6.svg

@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="800" height="500" viewBox="0 0 800 500" preserveAspectRatio="xMidYMid slice">
+	<title>snow</title>
+	<defs><linearGradient id="sky" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#c9d6e3"/><stop offset="1" stop-color="#eef3f8"/></linearGradient></defs>
+	<rect width="800" height="500" fill="url(#sky)"/>
+	<circle cx="320" cy="150" r="55" fill="#ffffff"/>
+	<path d="M0 330 L120 266 L250 300 L380 248 L520 310 L660 216 L800 290 L800 500 L0 500 Z" fill="#aebfd1"/>
+	<path d="M0 380 L90 330 L210 352 L340 300 L470 380 L600 330 L720 370 L800 340 L800 500 L0 500 Z" fill="#8199b3"/>
+	<path d="M0 440 Q200 410 400 430 T800 420 L800 500 L0 500 Z" fill="#4d6580"/>
+</svg>