Vendor templates and prefer local template assets

templates/blocks/cards/card-dark-overlay.html

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+<!-- 다크 오버레이 카드: 배경 이미지 + 흰 텍스트 오버레이 -->
+<!--
+  📋 card-dark-overlay
+  ─────────────────
+  용도: 키워드+짧은 설명을 시각적으로 강조. 이미지 위에 다크 오버레이 + 흰 텍스트.
+  슬롯: cards[] (각 카드에 image, title, description)
+  Figma 원본: 2-2_01 > 아이콘 카드 5열 (협업지원, 오류감소, 생산성향상 등)
+-->
+<div class="block-card-dark" style="--cd-count: {{ cards|length }}">
+  {% for card in cards %}
+  <div class="cd-card">
+    {% if card.image %}
+    <img class="cd-bg" src="{{ card.image }}" alt="">
+    {% else %}
+    <div class="cd-bg cd-bg-default"></div>
+    {% endif %}
+    <div class="cd-overlay">
+      <div class="cd-title">{{ card.title }}</div>
+      {% if card.description %}<div class="cd-desc">{{ card.description }}</div>{% endif %}
+    </div>
+  </div>
+  {% endfor %}
+</div>
+
+<style>
+.block-card-dark {
+  display: grid;
+  grid-template-columns: repeat(var(--cd-count, 3), 1fr);
+  gap: 12px;
+}
+.cd-card {
+  position: relative;
+  border-radius: var(--radius);
+  overflow: hidden;
+  height: 200px;
+}
+.cd-bg {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  z-index: 1;
+}
+.cd-bg-default {
+  background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
+}
+.cd-overlay {
+  position: absolute;
+  inset: 0;
+  z-index: 2;
+  background: linear-gradient(180deg, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.55) 100%);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 16px;
+  text-align: center;
+  color: #ffffff;
+}
+.cd-title {
+  font-size: 18px;
+  font-weight: 800;
+  line-height: 1.3;
+  margin-bottom: 6px;
+  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
+}
+.cd-desc {
+  white-space: pre-line;
+  font-size: 12px;
+  font-weight: 400;
+  line-height: 1.5;
+  opacity: 0.9;
+  text-shadow: 0 1px 3px rgba(0,0,0,0.3);
+  white-space: pre-line;
+}
+</style>