Redesign Webinterface: Voxel-Game-Ästhetik

- Selbst gehostete Fonts (Inter Variable, JetBrains Mono) — kein CDN
- Voxel-Würfel-Logo (SVG), Grid-Hintergrund mit grünem Glow, Gradient-Hero
- Devlogs als Timeline mit Voxel-Markern, Datums-Chips und Relativzeit
- Commits als Zeilen-Liste mit SHA-, Repo- und Branch-Chips statt Tabelle
- Discord-Login-Button mit Logo, User-Chip mit Avatar im Header
- Mobile-Layout (Karten, umbrechende Commit-Zeilen)
- Im Browser verifiziert: Desktop + Mobile, Devlogs + Commits (mit Admin-Session)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package-lock.json

@@ -8,6 +8,8 @@
       "name": "ecobot-frontend",
       "version": "0.1.0",
       "dependencies": {
+        "@fontsource-variable/inter": "^5.3.0",
+        "@fontsource/jetbrains-mono": "^5.3.0",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "react-router-dom": "^7.1.0"
@@ -741,6 +743,24 @@
         "node": ">=18"
       }
     },
+    "node_modules/@fontsource-variable/inter": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource-variable/inter/-/inter-5.3.0.tgz",
+      "integrity": "sha512-OupL48va4JNofb97w6NYeF9S7W/kHNKM0Er8Dem5nqi4jeOLrVJDoE8tZEpnMJmtkvNbB1EIPPwHcdkF6b1oUA==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
+    "node_modules/@fontsource/jetbrains-mono": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/jetbrains-mono/-/jetbrains-mono-5.3.0.tgz",
+      "integrity": "sha512-fqDfB5I9f1p1TV486aUgB9t8zP84P0O1FtQR5Ol9vjwPy+S+EIGlVYm1cvj2W5shcZMTg2nZFdVMoH5wFu8a1A==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",