Add local Roboto font and new images for branding

public/fonts/roboto/roboto.css

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+/**
+ * Roboto Font - Local Hosting
+ *
+ * This file provides @font-face declarations for the Roboto font family.
+ * The font files are hosted locally for DSGVO compliance and better performance.
+ *
+ * Font: Roboto Variable Font (Weight 100-900)
+ * Format: WOFF2 (best compression, modern browsers)
+ * Coverage: Latin characters (U+0000-00FF, U+0131, U+0152-0153, etc.)
+ */
+
+/* Roboto Variable Font - Normal Style (Latin) */
+/* Supports all weights from 100-900 */
+@font-face {
+  font-family: 'Roboto';
+  font-style: normal;
+  font-weight: 100 900;
+  font-stretch: 100%;
+  font-display: block;
+  src: url('/fonts/roboto/Roboto-VariableFont-latin.woff2') format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}