feat(web): M6.5 股票筛选页（/selection）—— 评分/条件双模式 + 当前/历史选股

- app/selection/page.tsx：因子评分（多因子+权重+TopN）与条件模式（结构化条件行
  编辑：static.*/因子/close>ma60/ROE 等，AND 语义）；as_of 留空=最近交易日；
  结果表（rank/symbol/score/因子值/入选理由）+ 最近选股记录点击回看
- lib/types.ts：SelectionQuery/Condition/Candidate/Result/Meta/Run DTO
- app-shell 导航加入「股票筛选」；rail 脚注与 Dashboard 文案 SQLite→MySQL（M-DB 收尾）
- 端到端验证：真实 MySQL 上 POST /api/selections 返回候选并落库可读回；
  /selection 页面 200；后端全量 pytest + 前端 tsc --noEmit 通过

frontend/web/lib/types.ts

@@ -73,3 +73,56 @@ export interface FactorTestReport {
   sample_days: number;
   unimplemented: string[];
 }
+
+/* ---- 选股系统（v2 §14/§21.1，与 domain/entities/selection.py 对应） ---- */
+
+export interface SelectionCondition {
+  field: string;
+  op: "gt" | "gte" | "lt" | "lte" | "eq" | "ne" | "in" | "not_in";
+  value?: number | string | (number | string)[] | null;
+  ref?: string | null;
+}
+
+export interface SelectionQuery {
+  universe: { exclude_st?: boolean; min_listing_days?: number };
+  as_of?: string | null; // null/省略 = 最近交易日
+  method: "score" | "condition";
+  factors: { name: string; weight: number }[];
+  conditions: SelectionCondition[];
+  top_n?: number | null;
+  top_pct?: number | null;
+  min_score?: number | null;
+}
+
+export interface SelectionCandidate {
+  symbol: string;
+  rank: number;
+  score: number;
+  factor_values: Record<string, number>;
+  filter_status: string[];
+  selection_reason: string[];
+}
+
+export interface SelectionResult {
+  as_of_date: string;
+  method: string;
+  statistics: { universe_size: number; evaluated: number; selected: number };
+  candidates: SelectionCandidate[];
+  unimplemented: string[];
+  config_snapshot: Record<string, unknown>;
+}
+
+export interface SelectionMeta {
+  id: string;
+  as_of: string;
+  method: string;
+  universe_size: number;
+  selected: number;
+  created_at?: string | null;
+}
+
+export interface SelectionRun {
+  selection_id: string;
+  result: SelectionResult;
+}
+