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/server/processing/processor.ts

@@ -1,12 +1,18 @@
 import type Database from "bun:sqlite";
 
+import { generateText } from "ai";
+
 import type { MaterialType } from "../../shared/api";
 import type { Logger } from "../logger";
 
 import { and, asc, eq } from "drizzle-orm";
 
+import { buildProviderRegistry } from "../ai/registry";
 import { notDeleted, timestamp, wrap } from "../db/connection";
+import { listEntityNames } from "../db/entities";
+import { getModelWithProvider, listModels } from "../db/models";
 import { materials } from "../db/schema";
+import { getSettings } from "../db/settings";
 
 import { getTemplate } from "./templates";
 
@@ -17,6 +23,7 @@ export interface ProcessableMaterial {
   description: string;
   id: string;
   materialType: MaterialType;
+  projectId: string;
 }
 
 export class MaterialProcessor {
@@ -101,6 +108,7 @@ export class MaterialProcessor {
       description: row.description,
       id: row.id,
       materialType: row.materialType as MaterialType,
+      projectId: row.projectId,
     };
 
     let lastError: unknown;
@@ -143,9 +151,48 @@ export class MaterialProcessor {
     }
   }
 
-  protected processOne(material: ProcessableMaterial): Promise<string> {
+  protected async processOne(material: ProcessableMaterial): Promise<string> {
+    const modelInfo = getDefaultTextModel(this.db);
+    if (!modelInfo) {
+      throw new Error("没有可用的文本模型，请在设置中配置默认模型或添加至少一个模型");
+    }
+
+    const registry = buildProviderRegistry(this.db);
+    const model = registry.languageModel(`${modelInfo.providerId}:${modelInfo.externalId}`);
+    const existingEntities = listEntityNames(this.db, material.projectId);
     const template = getTemplate(material.materialType);
-    // TODO: 替换为真实 AI Agent 调用
-    return Promise.resolve(template.outputTemplate.replace("{description}", material.description));
+    const userPrompt = template.buildUserPrompt(material.description, existingEntities);
+
+    const result = await generateText({
+      model,
+      prompt: userPrompt,
+      system: template.systemPrompt,
+    });
+
+    const processingResult = template.parseOutput(result.text);
+    return JSON.stringify(processingResult);
   }
 }
+
+function getDefaultTextModel(db: Database): { externalId: string; providerId: string } | null {
+  try {
+    const settings = getSettings(db);
+    if (settings.defaultModels?.text) {
+      const result = getModelWithProvider(db, settings.defaultModels.text);
+      if (!("error" in result)) {
+        return { externalId: result.model.externalId, providerId: result.provider.id };
+      }
+    }
+  } catch {
+    // settings 不存在或解析失败，使用 fallback
+  }
+
+  const fallback = listModels(db, { page: 1, pageSize: 1 });
+  const firstModel = fallback.items[0];
+  if (!firstModel) return null;
+
+  const result = getModelWithProvider(db, firstModel.id);
+  if ("error" in result) return null;
+
+  return { externalId: result.model.externalId, providerId: result.provider.id };
+}