Fix nginx: add location block for double fonts/ path in GrampsWeb (STI-91)

GrampsWeb's fonts.css references url('fonts/file.woff2') but is served
from /ahnenforschung/fonts/fonts.css, causing the browser to request
/ahnenforschung/fonts/fonts/file.woff2 (double fonts/ directory).

Instead of relying on sub_filter to rewrite CSS content, add a dedicated
location block that proxies /ahnenforschung/fonts/fonts/ to the correct
/fonts/ path on the GrampsWeb container. This is more robust as it works
regardless of CSS content-type matching.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

deploy-production/nginx.conf

@@ -82,6 +82,17 @@ server {
         proxy_send_timeout 300s;
     }
 
+    # GrampsWeb: fix double fonts/ path from CSS relative URL resolution
+    # fonts.css at /ahnenforschung/fonts/ references url('fonts/file.woff2')
+    # which resolves to /ahnenforschung/fonts/fonts/file.woff2
+    location /ahnenforschung/fonts/fonts/ {
+        proxy_pass http://127.0.0.1:8090/fonts/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
     # GrampsWeb Ahnenforschung
     # All path rewriting happens here via sub_filter — no container-side patching needed.
     # GrampsWeb SPA uses Vaadin Router with absolute paths; the injected History API
@@ -126,11 +137,7 @@ server {
         # JS: service worker route handling
         sub_filter 'createHandlerBoundToURL("/index.html")' 'createHandlerBoundToURL("/ahnenforschung/index.html")';
 
-        # CSS: fix font paths in fonts.css — the CSS lives at /ahnenforschung/fonts/fonts.css
-        # and references url('fonts/MaterialIcons.woff2') which resolves to
-        # /ahnenforschung/fonts/fonts/MaterialIcons.woff2 (double fonts/).
-        # Strip the fonts/ prefix so url('MaterialIcons.woff2') resolves correctly.
-        sub_filter "url('fonts/" "url('";
+        # CSS font paths: handled by separate location block for /ahnenforschung/fonts/fonts/
 
         # WebSocket support
         proxy_http_version 1.1;