feat: topology on its own landscape page, as large as possible

The topology image was shrunk inside the flex container used for rack
images. Each site's topology now gets a dedicated A4 landscape page
(named @page in PDF, landscape section in Word) with the section and
site headings, scaled to the full usable width or height depending on
its aspect ratio. The document switches back to portrait only when more
content follows, so no blank pages are produced. The TOC includes
headings on landscape pages.

Also fix Word exports without a template using US Letter instead of A4.

Bump version to 0.6.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netbox_customer_export/sections.py

@@ -7,7 +7,7 @@ from django.apps import apps
 from django.contrib.contenttypes.models import ContentType
 from netbox.plugins import get_plugin_config
 
-from .blocks import EMPTY, H, IMAGES, KV, P, PAGEBREAK, T, get
+from .blocks import EMPTY, H, IMAGES, KV, LANDSCAPE, P, PAGEBREAK, T, get
 from .rack_png import render_rack_png
 from .rack_svg import render_rack_svg
 
@@ -412,12 +412,13 @@ def licenses(scope, opts):
 def topology(scope, opts):
     from .topology import build_graphs, render_png
 
-    blocks = [H(1, "Netzwerk-Topologie")]
+    title = H(1, "Netzwerk-Topologie")
     graphs = build_graphs(scope, opts)
     if not graphs:
-        return _empty(opts, blocks, "Keine verkabelten Geräte gefunden.")
+        return _empty(opts, [title], "Keine verkabelten Geräte gefunden.")
     ports = "ports" in (opts.get("topo_details") or [])
-    for g in graphs:
-        blocks.append(H(2, g.title))
-        blocks.append(IMAGES([(None, "", render_png(g, show_ports=ports))], wide=True))
-    return blocks
+    # Je Standort eine Querformat-Seite; die Abschnittsüberschrift steht mit auf der ersten
+    return [
+        LANDSCAPE(([title] if i == 0 else []) + [H(2, g.title)], render_png(g, show_ports=ports))
+        for i, g in enumerate(graphs)
+    ]