chore(docs, build): add E2E smoke test reports, favicon, and build robustness improvements

- Documented E2E smoke test results for Ktor 3.4.0 and Exposed 1.0.0 migration in new reports and session logs.
- Introduced a fallback mechanism for desktop and web-app builds, ensuring robustness in distribution creation and static asset handling.
- Added a default SVG favicon to prevent 404 errors in the web-app.
- Updated Nginx configuration and Dockerfiles to include improved artifact paths, fallback handling, and script corrections.

config/docker/nginx/web-app/nginx.conf

@@ -72,6 +72,13 @@ http {
             }
         }
 
+        # Favicon: alias .ico Anfrage auf bereitgestelltes SVG
+        location = /favicon.ico {
+            alias /usr/share/nginx/html/favicon.svg;
+            add_header Content-Type image/svg+xml;
+            expires 7d;
+        }
+
         # Proxy API calls zu Gateway
         location /api/ {
             proxy_pass http://api-gateway;