feat: SEO, PWA, and performance optimizations

- Add sitemap.xml endpoint and update robots.txt for SEO - Improve
manifest.json with richer metadata and categories - Add meta tags for
social sharing and accessibility - Preload critical assets and fonts for
faster loading - Optimize login background image and resource hints -
Enhance service worker for better caching strategies - Add security
headers to server responses - Update Vite config for chunking and
dependency optimization - Add logboek.md for project tracking

static/manifest.json

@@ -1,7 +1,7 @@
 {
   "short_name": "Serengo",
-  "name": "Serengo",
-  "description": "meet the unexpected.",
+  "name": "Serengo - meet the unexpected.",
+  "description": "Discover unexpected places and experiences with Serengo's interactive map. Find hidden gems and explore your surroundings like never before.",
   "icons": [
     {
       "src": "/logo.svg",
@@ -10,8 +10,11 @@
       "purpose": "any maskable"
     }
   ],
-  "start_url": ".",
+  "start_url": "/",
   "display": "standalone",
-  "theme_color": "white",
-  "background_color": "white"
+  "orientation": "portrait-primary",
+  "theme_color": "#333333",
+  "background_color": "#f8f8f8",
+  "scope": "/",
+  "categories": ["travel", "maps", "discovery"]
 }