feat(knowledge): 摄影示例体系常量（具象化数据）

Author: Aparencia

app/src/utils/knowledgeSample.test.ts

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+/**
+ * knowledgeSample.test.ts — 摄影示例体系常量结构校验（v0.13.7 具象化）。
+ *
+ * @ai-context: 示例数据即 golden——节点层级/概念三问/模型三字段/决策四行
+ *              必须完整，缺字段=示例残缺（具象化失败）。
+ */
+import { describe, expect, it } from "vitest";
+import { SAMPLE_SYSTEM } from "./knowledgeSample";
+
+describe("SAMPLE_SYSTEM 结构完整性", () => {
+  it("领域体系元数据完整", () => {
+    expect(SAMPLE_SYSTEM.name).toBe("摄影");
+    expect(SAMPLE_SYSTEM.kind).toBe("domain");
+  });
+
+  it("问题树 7 节点且含层级（有父节点）", () => {
+    expect(SAMPLE_SYSTEM.nodes.length).toBe(7);
+    expect(SAMPLE_SYSTEM.nodes.some((n) => n.parentId != null)).toBe(true);
+    expect(SAMPLE_SYSTEM.nodes.some((n) => n.type === "scenario")).toBe(true);
+  });
+
+  it("概念 3 个且三问全填", () => {
+    expect(SAMPLE_SYSTEM.concepts.length).toBe(3);
+    for (const c of SAMPLE_SYSTEM.concepts) {
+      expect(c.essence).toBeTruthy();
+      expect(c.boundary).toBeTruthy();
+      expect(c.relation).toBeTruthy();
+    }
+  });
+
+  it("模型 1 个且 claim/valid_when/invalid_when 全填", () => {
+    expect(SAMPLE_SYSTEM.models.length).toBe(1);
+    const m = SAMPLE_SYSTEM.models[0];
+    expect(m.claim).toBeTruthy();
+    expect(m.validWhen).toBeTruthy();
+    expect(m.invalidWhen).toBeTruthy();
+  });
+});

app/src/utils/knowledgeSample.ts

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+/**
+ * knowledgeSample.ts — 摄影示例体系常量（v0.13.7 具象化）。
+ *
+ * @ai-context: 示例≠预填（纪律裁决 2026-08-24）——示例是用户可见的完整
+ *              参照物，复制后处于"待改造"状态。结构对应既有 command 入参，
+ *              复制时逐条调 create/add 命令落库（零新命令）。
+ */
+import type { KnowledgeNodeType, SystemKind } from "../types/knowledge";
+
+export interface SampleNode {
+  type: KnowledgeNodeType;
+  text: string;
+  parentId: number | null;
+}
+export interface SampleConcept {
+  name: string;
+  essence: string;
+  boundary: string;
+  relation: string;
+}
+export interface SampleModel {
+  name: string;
+  disciplines: string[];
+  claim: string;
+  validWhen: string;
+  invalidWhen: string;
+}
+
+export const SAMPLE_SYSTEM = {
+  name: "摄影",
+  kind: "domain" as SystemKind,
+  coreQuestion: "如何拍出有表达力、不灰蒙蒙的照片？",
+  /** 问题树：7 节点（4 根 + 3 子；含 1 场景根）——parentId 索引指向 nodes 内下标 */
+  nodes: [
+    { type: "question", text: "照片为什么发灰、不通透？", parentId: null },        // 0
+    { type: "question", text: "怎么判断一张照片曝光是否准确？", parentId: 0 },       // 1
+    { type: "question", text: "高光溢出了怎么办？", parentId: 0 },                  // 2
+    { type: "question", text: "为什么拍人像背景虚化不了？", parentId: null },        // 3
+    { type: "question", text: "怎么让背景虚化（光圈优先）？", parentId: 3 },         // 4
+    { type: "question", text: "构图总是很平淡怎么办？", parentId: null },            // 5
+    { type: "scenario", text: "本周修好 10 张发灰的旅行照", parentId: null },       // 6
+  ] as SampleNode[],
+  concepts: [
+    {
+      name: "曝光三角",
+      essence: "光圈/快门/ISO 三者平衡光量的关系",
+      boundary: "只影响明暗，不影响景深的是 ISO",
+      relation: "感光元件对光的响应，是后期降噪的基础",
+    },
+    {
+      name: "安全快门",
+      essence: "1/焦距 的倒数，低于它手抖必糊",
+      boundary: "有防抖/三脚架时失效",
+      relation: "与曝光三角中快门联动",
+    },
+    {
+      name: "三分构图",
+      essence: "把主体放在画面 1/3 分割线上",
+      boundary: "对称构图/居中构图时不用",
+      relation: "与引导线结合更出效果",
+    },
+  ] as SampleConcept[],
+  models: [
+    {
+      name: "黄金时刻法则",
+      disciplines: ["摄影"],
+      claim: "日出日落前后 1 小时光质最佳",
+      validWhen: "户外自然光",
+      invalidWhen: "室内闪光灯/阴天正午想拍蓝调",
+    },
+  ] as SampleModel[],
+};