feat: 添加 L4 AI 诊断报告（后端 DeepSeek 端点 + 前端摘要块与详情页）

frontend/src/pages/Analytics/Analytics.jsx

@@ -7,6 +7,7 @@ import EditorCompare from '../../components/Analytics/EditorCompare'
 import QuarterCompare from '../../components/Analytics/QuarterCompare'
 import TopicCompare from '../../components/Analytics/TopicCompare'
 import QuadrantChart from '../../components/Analytics/QuadrantChart'
+import DiagnosisSummary from '../../components/Analytics/DiagnosisSummary'
 import './Analytics.css'
 
 /**
@@ -565,11 +566,12 @@ function Analytics() {
             )}
           </div>
 
-          {/* ── AI 诊断报告占位 ── */}
-          <div className="analytics-chart-card" style={{ textAlign: 'center', padding: '40px 24px' }}>
-            <h2 className="analytics-chart-title" style={{ textAlign: 'left' }}>AI 诊断报告</h2>
-            <p style={{ color: '#aaa', fontSize: 14 }}>即将上线 - 基于双引擎模型的智能收视诊断</p>
-          </div>
+          {/* ── AI 诊断报告 ── */}
+          <DiagnosisSummary
+            episodes={filteredEpisodes}
+            yearlyTarget={yearlyTarget}
+            selectedYear={selectedYear}
+          />
 
           {/* ── 双引擎象限图 ── */}
           <div className="analytics-chart-card">