feat(ebook): add phrase matching display and update search result structure

python/ebook_search/api/templates/partials/results.html

@@ -82,6 +82,14 @@
                         </div>
                     {% endif %}
                 </dl>
+                {% if result.matched_phrases %}
+                    <p class="phrase-matches">
+                        <span class="phrase-matches-label">boosted by</span>
+                        {% for phrase in result.matched_phrases %}
+                            <span class="phrase-match">{{ phrase }}</span>
+                        {% endfor %}
+                    </p>
+                {% endif %}
             </li>
         {% endfor %}
     </ol>