feat: enhance UI, refactor services, improve templates and tests

- Replace image_extractor with pdf_image_extractor service
- Enhance pi_client with expanded API capabilities
- Improve summarizer service with additional features
- Update admin routes with more endpoints
- Add login page template
- Enhance detail page with comprehensive layout
- Improve search and trends pages
- Update base template with additional elements
- Refactor tests for better coverage
- Add validate_summary script
- Update project configuration and dependencies

app/templates/trends.html

@@ -32,20 +32,20 @@ endblock %} {% block content %}
 {% endblock %} {% block scripts %}
 <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.7/dist/chart.umd.min.js"></script>
 <script>
-  // 颜色配置（kami 风格墨蓝色系）
+  // 颜色配置（Kami ink-blue 暖调色系）
   const COLORS = {
-    primary: '#2d5f8a',
-    primaryLight: 'rgba(45, 95, 138, 0.2)',
-    accent: '#5a9bc7',
-    success: '#388e3c',
-    warning: '#f57f17',
-    danger: '#c62828',
-    muted: '#4a4a6a',
+    primary: '#1B365D',
+    primaryLight: 'rgba(27, 54, 93, 0.12)',
+    accent: '#2a4d7a',
+    success: '#3d6e3d',
+    warning: '#7a6430',
+    danger: '#8c2828',
+    muted: '#6b6a64',
     palette: [
-      '#2d5f8a', '#5a9bc7', '#388e3c', '#f57f17', '#c62828',
-      '#7b1fa2', '#00838f', '#ef6c00', '#455a64', '#827717',
-      '#1565c0', '#ad1457', '#00695c', '#e65100', '#283593',
-      '#9e9d24', '#6a1b9a', '#00838f', '#4e342e', '#37474f',
+      '#1B365D', '#2a4d7a', '#3d6e3d', '#7a6430', '#8c2828',
+      '#4a4070', '#2d6b6e', '#8a5a2a', '#504e49', '#5c6030',
+      '#2b4a80', '#70304a', '#2d5e56', '#7a4a10', '#353a60',
+      '#6a6a28', '#552a5a', '#2d6b6e', '#4a3828', '#3d4450',
     ],
   };