perf: implement multi-phase performance optimizations for PageSpeed 90+

- Resized and compressed oversized logo (204KB -> 21KB)
- Optimized large media images (hs-kabel.png, contact-hero.jpg)
- Implemented dynamic lazy-loading for home page sections
- Tuned Sentry traces sample rate (1.0 -> 0.1)
- Refined font loading and fixed redundant analytics tracking

sentry.client.config.ts

@@ -4,7 +4,7 @@ import { config } from "./lib/config";
 if (config.errors.glitchtip.enabled) {
   Sentry.init({
     dsn: config.errors.glitchtip.dsn,
-    tracesSampleRate: 1.0,
+    tracesSampleRate: 0.1,
     debug: config.isDevelopment,
     environment: config.target || "production",
     // Use the proxy path defined in config