Fix GrampsWeb subpath: patch location.href redirects to root (STI-90)

GrampsWeb JS has 6 instances of location.href="/" that redirect users
to the root domain (Django app) instead of /ahnenforschung/. These
are now patched at container startup alongside the API path rewrites.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compose.yml

@@ -227,6 +227,8 @@ services:
               sed -i 's|`/fonts/|`'"$${SUBPATH}"'fonts/|g' "$$f"
               sed -i "s|\"/assets/|\"$${SUBPATH}assets/|g" "$$f"
               sed -i 's|`/assets/|`'"$${SUBPATH}"'assets/|g' "$$f"
+              sed -i "s|location\.href=\"/\"|location.href=\"$$SUBPATH\"|g" "$$f"
+              sed -i "s|document\.location\.href=\"/\"|document.location.href=\"$$SUBPATH\"|g" "$$f"
               echo "[grampsweb]   patched JS paths: $$f"
             fi
           done