feat: AI市场分析功能

- 后端：AI分析服务、工具调用、定时任务
- 前端：报告列表、详情页、Mermaid图表支持
- 支持OpenAI API兼容模型
- 收盘后自动分析生成报告

src/styles.css

@@ -146,3 +146,96 @@
     font-family: var(--font-sans);
   }
 }
+
+/* AI Report Content Styles */
+.ai-report-content {
+  color: #c9d1d9;
+  line-height: 1.7;
+}
+
+.ai-report-content h1,
+.ai-report-content h2,
+.ai-report-content h3,
+.ai-report-content h4 {
+  color: #e6edf3;
+  font-weight: 600;
+  margin-top: 1.5em;
+  margin-bottom: 0.5em;
+}
+
+.ai-report-content h1 { font-size: 1.5em; }
+.ai-report-content h2 { font-size: 1.3em; }
+.ai-report-content h3 { font-size: 1.15em; }
+
+.ai-report-content p {
+  margin-bottom: 0.8em;
+}
+
+.ai-report-content strong {
+  color: #e6edf3;
+  font-weight: 600;
+}
+
+.ai-report-content ul,
+.ai-report-content ol {
+  margin: 0.5em 0;
+  padding-left: 1.5em;
+}
+
+.ai-report-content li {
+  margin-bottom: 0.3em;
+}
+
+.ai-report-content blockquote {
+  border-left: 3px solid #30363d;
+  padding-left: 1em;
+  margin: 0.8em 0;
+  color: #8b949e;
+}
+
+.ai-report-content code {
+  background: #0d1117;
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+  font-size: 0.9em;
+  color: #79c0ff;
+}
+
+.ai-report-content pre {
+  background: #0d1117;
+  padding: 1em;
+  border-radius: 6px;
+  overflow-x: auto;
+  margin: 0.8em 0;
+}
+
+.ai-report-content pre code {
+  background: none;
+  padding: 0;
+  color: #c9d1d9;
+}
+
+.ai-report-content table {
+  width: 100%;
+  border-collapse: collapse;
+  margin: 0.8em 0;
+}
+
+.ai-report-content th,
+.ai-report-content td {
+  border: 1px solid #30363d;
+  padding: 0.5em 0.8em;
+  text-align: left;
+}
+
+.ai-report-content th {
+  background: #21262d;
+  color: #e6edf3;
+  font-weight: 600;
+}
+
+.ai-report-content hr {
+  border: none;
+  border-top: 1px solid #30363d;
+  margin: 1.5em 0;
+}