feat: 实现阶段二实体体系——AI预处理真实化+实体CRUD+审核归一化

- 新增 entities 数据表(含迁移)、Entity 类型、DAO 层完整 CRUD
- AI 预处理管道接入真实模型(generateText)，输出结构化 JSON(摘要+规范化内容+候选实体)
- 模板接口重构为 {systemPrompt, buildUserPrompt, parseOutput}，general/meeting 模板真实化
- 新增 5 个实体路由端点 + 实体管理前端页面(列表/详情/编辑弹窗)
- 审核面板增强：展示 AI 预处理结构化结果+候选实体归一化面板(合并/新建/选择/放弃)
- 素材通过时根据用户确认的候选实体写入 entities 表
- 工作台菜单新增"实体"入口
- 新增 entities DAO 测试(16)、processor 测试(11)、路由测试(8)，服务端 367 测试全部通过
- TypeScript 0 错误

src/shared/api.ts

@@ -55,10 +55,77 @@ export interface CreateProviderRequest {
   type: ProviderType;
 }
 
-// ==========================================
-// 在此定义你的业务类型
-// 前后端共享的类型都放在这个文件中
-// ==========================================
+export interface ApproveMaterialRequest {
+  entityConfirmations?: EntityConfirmation[];
+}
+
+export interface CandidateEntity {
+  context: string;
+  matchedEntityId: null | string;
+  name: string;
+  type: EntityType;
+}
+
+export interface CreateEntityRequest {
+  aliases?: string[];
+  description?: string;
+  name: string;
+  type: EntityType;
+}
+
+export interface Entity {
+  aliases: string[];
+  createdAt: string;
+  description: string;
+  id: string;
+  name: string;
+  projectId: string;
+  type: EntityType;
+  updatedAt: string;
+}
+
+export interface EntityConfirmation {
+  action: "create" | "discard" | "merge" | "select";
+  candidateIndex: number;
+  targetEntityId?: string;
+}
+
+export interface EntityListResponse {
+  items: Entity[];
+  page: number;
+  pageSize: number;
+  total: number;
+}
+
+export interface EntityResponse {
+  entity: Entity;
+}
+
+export const ENTITY_TYPES = [
+  "person",
+  "organization",
+  "system",
+  "feature",
+  "requirement",
+  "issue",
+  "term",
+  "other",
+] as const;
+
+export type EntityType = (typeof ENTITY_TYPES)[number];
+
+export interface ProcessingResult {
+  candidateEntities: CandidateEntity[];
+  normalizedContent: string;
+  summary: string;
+}
+
+export interface UpdateEntityRequest {
+  aliases?: string[];
+  description?: string;
+  name?: string;
+  type?: EntityType;
+}
 
 export interface ListSortParams {
   sortBy?: string;