feat: 新增外部因素分析模块+综合评分引擎+算法文档重构

新增模块:
- fund_flow_analyzer.py: 主力资金流向分析(P0, ±20)
- market_sentiment.py: 市场情绪指标(P1, ±10)
- external_factors.py: 北向资金/美股/大宗商品/汇率(P2-P4,P7)
- news_analyzer.py: 公告/并购/政策面LLM分析(P5-P6)
- score_engine.py: 综合评分引擎，整合技术面+外部因素

路由更新:
- analysis.py: deep_analyze接入综合评分，根据最终评级修正买卖建议
- market.py: 新增4个外部因素API端点
- trades.py: 交易路由更新

算法文档重构:
- 章节重排: 技术面(二三)→外部因素(四)→买卖决策(五)→数据源(六)→性能(七)
- 架构图更新为五层，标注章节对应
- 5.1/5.2标注纯技术面，5.3整合外部因素修正推荐

stock-html/static/js/app.js

@@ -92,10 +92,24 @@
                     scanSummaryCollapsed: false,
                     fullScanSignalDist: [],
                     
-                    // 找牛股
-                    bullStocksData: null,   // { stages: {1:[...], 2:[...]}, summary: {}, stage_info: [...] }
+                    // 找牛股（保留兼容）
+                    bullStocksData: null,
                     bullStocksLoading: false,
-                    bullActiveStage: 2,     // 默认显示阶段2=龙抬头（最佳买点）
+                    bullActiveStage: 2,
+
+                    // 个股深析
+                    deepCode: '',
+                    deepReport: null,
+                    deepLoading: false,
+
+                    // 模型页子tab
+                    modelSubTab: 'system',
+
+                    // 买入分析
+                    buyAnalysisList: [],
+                    buyAnalysisLoading: false,
+                    buyAnalysisProgress: 0,
+                    buyAnalysisTotal: 0,
                     
                     // 交易记录页面
                     trades: [],
@@ -2239,7 +2253,7 @@
                             params: holding ? { holdingStocks: holding } : {}
                         });
                         if (resp.data.success) {
-                            this.bullStocksData = resp.data;  // { stages, summary, total, stage_info }
+                            this.bullStocksData = resp.data;
                         } else {
                             this.showToast(resp.data.error || '获取牛股数据失败', 'error');
                         }
@@ -2251,6 +2265,75 @@
                     }
                 },
 
+                async fetchDeepAnalysis() {
+                    const code = (this.deepCode || '').trim();
+                    if (!code || code.length < 6) {
+                        this.showToast('请输入6位股票代码', 'error');
+                        return;
+                    }
+                    this.deepLoading = true;
+                    this.deepReport = null;
+                    try {
+                        const resp = await axios.post('/api/deep_analyze', { stock_code: code });
+                        if (resp.data.success) {
+                            this.deepReport = resp.data.report;
+                        } else {
+                            this.showToast(resp.data.error || '分析失败', 'error');
+                        }
+                    } catch (err) {
+                        console.error('深度分析失败:', err);
+                        this.showToast('深度分析失败: ' + (err.response?.data?.error || err.message), 'error');
+                    } finally {
+                        this.deepLoading = false;
+                    }
+                },
+
+                async fetchBuyAnalysis() {
+                    if (this.buyAnalysisLoading) return;
+                    this.buyAnalysisLoading = true;
+                    this.buyAnalysisList = [];
+                    this.buyAnalysisProgress = 0;
+                    try {
+                        const scanResp = await axios.get('/api/scan_results', {
+                            params: { per_page: 200, recommend_text: '买入' }
+                        });
+                        if (!scanResp.data.success) {
+                            this.showToast('获取买入推荐失败', 'error');
+                            return;
+                        }
+                        const buyStocks = scanResp.data.results || [];
+                        this.buyAnalysisTotal = buyStocks.length;
+                        if (buyStocks.length === 0) {
+                            this.showToast('当前无买入推荐股票', 'info');
+                            return;
+                        }
+                        const results = [];
+                        for (let i = 0; i < buyStocks.length; i++) {
+                            this.buyAnalysisProgress = i + 1;
+                            try {
+                                const resp = await axios.post('/api/deep_analyze', {
+                                    stock_code: buyStocks[i].code,
+                                    skip_llm: true
+                                });
+                                if (resp.data.success) {
+                                    const report = resp.data.report;
+                                    report._expanded = false;
+                                    results.push(report);
+                                }
+                            } catch (e) {
+                                console.warn('分析失败:', buyStocks[i].code, e.message);
+                            }
+                        }
+                        results.sort((a, b) => b.deep_score - a.deep_score);
+                        this.buyAnalysisList = results;
+                    } catch (err) {
+                        console.error('买入分析失败:', err);
+                        this.showToast('买入分析失败: ' + (err.message || '未知错误'), 'error');
+                    } finally {
+                        this.buyAnalysisLoading = false;
+                    }
+                },
+
                 getBullStageStocks(stageNum) {
                     if (!this.bullStocksData || !this.bullStocksData.stages) return [];
                     return this.bullStocksData.stages[String(stageNum)] || [];