feat: add compare, trends routes, embedder service, and phase5 tests

app/templates/search.html

@@ -11,6 +11,21 @@
     {% if tag %}
     <input type="hidden" name="tag" value="{{ tag }}">
     {% endif %}
+
+    {# 模式切换 #}
+    {% if chroma_enabled %}
+    <div class="search-mode-toggle">
+      <label class="mode-option {% if mode == 'keyword' or not mode %}active{% endif %}">
+        <input type="radio" name="mode" value="keyword" {% if mode == 'keyword' or not mode %}checked{% endif %}>
+        关键词
+      </label>
+      <label class="mode-option {% if mode == 'semantic' %}active{% endif %}">
+        <input type="radio" name="mode" value="semantic" {% if mode == 'semantic' %}checked{% endif %}>
+        语义搜索
+      </label>
+    </div>
+    {% endif %}
+
     <button type="submit" class="search-btn">搜索</button>
   </form>
 
@@ -18,10 +33,10 @@
   {% if all_tags %}
   <div class="tag-filter">
     <span class="tag-filter-label">标签：</span>
-    <a href="/search{% if query %}?q={{ query }}{% endif %}"
+    <a href="/search?q={{ query }}&mode={{ mode }}{% if tag %}&tag={{ tag }}{% endif %}"
        class="tag-chip {% if not tag %}active{% endif %}">全部</a>
     {% for t in all_tags %}
-    <a href="/search?q={{ query }}&tag={{ t }}"
+    <a href="/search?q={{ query }}&tag={{ t }}&mode={{ mode }}"
        class="tag-chip {% if t == tag %}active{% endif %}">{{ t }}</a>
     {% endfor %}
   </div>
@@ -30,12 +45,12 @@
   {% if query or tag %}
   {# 搜索结果元信息 #}
   <div class="search-meta">
-    <span>找到 {{ total }} 条结果</span>
+    <span>找到 {{ total }} 条结果{% if mode == 'semantic' %}（语义模式）{% endif %}</span>
     <div class="sort-toggle">
-      <a href="/search?q={{ query }}&tag={{ tag }}&sort=relevance"
+      <a href="/search?q={{ query }}&tag={{ tag }}&mode={{ mode }}&sort=relevance"
          class="{% if sort == 'relevance' %}active{% endif %}">相关性</a>
       <span class="sort-divider">|</span>
-      <a href="/search?q={{ query }}&tag={{ tag }}&sort=date"
+      <a href="/search?q={{ query }}&tag={{ tag }}&mode={{ mode }}&sort=date"
          class="{% if sort == 'date' %}active{% endif %}">日期</a>
     </div>
   </div>
@@ -58,6 +73,11 @@
           </a>
         </h2>
         <span class="paper-upvotes">👍 {{ paper.upvotes }}</span>
+        {% if distances and paper.arxiv_id in distances %}
+        <span class="similarity-score" title="语义相似度距离">
+          🎯 {{ "%.3f"|format(distances[paper.arxiv_id]) }}
+        </span>
+        {% endif %}
       </div>
 
       {% if snippet and snippet.abstract %}
@@ -103,11 +123,11 @@
   {% if total_pages > 1 %}
   <nav class="pagination">
     {% if page > 1 %}
-    <a href="/search?q={{ query }}&tag={{ tag }}&sort={{ sort }}&page={{ page - 1 }}" class="page-btn">← 上一页</a>
+    <a href="/search?q={{ query }}&tag={{ tag }}&sort={{ sort }}&mode={{ mode }}&page={{ page - 1 }}" class="page-btn">← 上一页</a>
     {% endif %}
     <span class="page-info">{{ page }} / {{ total_pages }}</span>
     {% if page < total_pages %}
-    <a href="/search?q={{ query }}&tag={{ tag }}&sort={{ sort }}&page={{ page + 1 }}" class="page-btn">下一页 →</a>
+    <a href="/search?q={{ query }}&tag={{ tag }}&sort={{ sort }}&mode={{ mode }}&page={{ page + 1 }}" class="page-btn">下一页 →</a>
     {% endif %}
   </nav>
   {% endif %}