Migrate WordPress site to Hugo

Replaces the WordPress 7.0.2 / HitMag site with a static Hugo build,
deployed by Gitea Actions over rsync/SSH.

Content: 26 files (9 pages + 17 posts) as Markdown page bundles, plus
127 of 165 media attachments. The remaining 38 are media-library
leftovers that appear nowhere on the live site; they are listed in
MIGRATION.md.

The WXR export contains neither media binaries nor widgets, so both were
recovered from the live host before it is retired:
  - tools/fetch_media.py downloads all uploads, capping them at 2000px
  - tools/build_data.py scrapes the "Unsere Mitglieder" and
    "In Erinnerung" widgets into data/*.yaml

TablePress' six Termine tables became data/termine.yaml, rendered with
the newest year expanded and earlier years collapsed. Old permalinks are
not preserved (clean slugs, no redirects, as agreed).

Custom layouts, no third-party theme. Plain CSS, since the pinned Hugo
0.164.0 is the non-extended build and cannot compile Sass.

Verified: clean build with zero warnings, 718 internal links checked and
none broken, no surviving wp-content URLs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

layouts/_partials/post-card.html

@@ -0,0 +1,17 @@
+{{- /* Teaser card for a news post. Context: the page. */ -}}
+<article class="post-card">
+  {{ with partial "func/featured-image.html" . }}
+    {{ $thumb := .Fill "480x300 Center webp q80" }}
+    <a class="post-card-image" href="{{ $.RelPermalink }}" tabindex="-1" aria-hidden="true">
+      <img src="{{ $thumb.RelPermalink }}" width="{{ $thumb.Width }}" height="{{ $thumb.Height }}"
+           alt="" loading="lazy" decoding="async">
+    </a>
+  {{ end }}
+  <div class="post-card-body">
+    <h3 class="post-card-title"><a href="{{ .RelPermalink }}">{{ .Title }}</a></h3>
+    <p class="post-card-meta">
+      <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date | time.Format site.Params.dateFormat }}</time>
+    </p>
+    <p class="post-card-summary">{{ .Summary | plainify | truncate 160 }}</p>
+  </div>
+</article>