feat(web): F1/F2/F3 前端——拆书入库为规则 / 续写式链选择 / 模板库

- gen:api 纳入 /templates、chain continue_volume、teardown rules ingest 端点
- F1：GeneratorRunner 识别拆书为单对象入库（整 preview 作一条 teardown），
  ingestTable(BookTeardownResult)=rules，buildIngestRequest 组装 teardown 体，
  按 isSingleObjectIngest 隐藏勾选框、改文案「入库为规则」
- F2：ChainStarter 加链类型单选（draft_volume 从头写 / continue_volume 续写），
  chain_key 作 path 参传给 run（CHAIN_KINDS 对齐后端 SUPPORTED_CHAINS）
- F3：模板库页 app/templates + 全局 nav 入口 + TemplatesManager（列/建/删，乐观更新回滚）；
  GeneratorRunner 加 TemplateFiller「从模板填入」（body 填进 brief/text，纯前端）
- vitest 覆盖 templates/ingest teardown/templateFillTarget/CHAIN_KINDS 纯逻辑

apps/web/lib/templates/templates.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  buildTemplateCreateRequest,
+  EMPTY_TEMPLATE_DRAFT,
+  isTemplateDraftValid,
+  type TemplateDraft,
+} from "./templates";
+
+const draft = (over: Partial<TemplateDraft>): TemplateDraft => ({
+  ...EMPTY_TEMPLATE_DRAFT,
+  ...over,
+});
+
+describe("isTemplateDraftValid", () => {
+  it("returns true when title and body are both non-empty", () => {
+    expect(isTemplateDraftValid(draft({ title: "标题", body: "正文" }))).toBe(
+      true,
+    );
+  });
+
+  it("returns false when title is blank", () => {
+    expect(isTemplateDraftValid(draft({ title: "  ", body: "正文" }))).toBe(
+      false,
+    );
+  });
+
+  it("returns false when body is blank", () => {
+    expect(isTemplateDraftValid(draft({ title: "标题", body: "" }))).toBe(false);
+  });
+
+  it("returns false for the empty draft", () => {
+    expect(isTemplateDraftValid(EMPTY_TEMPLATE_DRAFT)).toBe(false);
+  });
+});
+
+describe("buildTemplateCreateRequest", () => {
+  it("trims title and body and includes optional fields", () => {
+    const body = buildTemplateCreateRequest(
+      draft({
+        title: "  脑洞模板  ",
+        body: "  写一个穿越故事  ",
+        category: " 脑洞 ",
+        toolKey: " idea ",
+      }),
+    );
+    expect(body).toEqual({
+      title: "脑洞模板",
+      body: "写一个穿越故事",
+      category: "脑洞",
+      tool_key: "idea",
+    });
+  });
+
+  it("nulls out blank category and tool_key", () => {
+    const body = buildTemplateCreateRequest(
+      draft({ title: "t", body: "b", category: "  ", toolKey: "" }),
+    );
+    expect(body.category).toBeNull();
+    expect(body.tool_key).toBeNull();
+  });
+});