feat: M4 文风 + M5 生成/多provider/Skill + Kimi Code 订阅接入 + 本地联调修复

M4（文风）: style-auditor 双轨（提取指纹/漂移第四审）+ jobs 长任务框架(zombie reaper) + 回炉 refine + GET /style read-back。
M5（生成+扩展）: worldbuilder/character-gen（入库 continuity 409 gate + partition_writes 白名单 + schema→JSONB 形变）；
  网关多 provider 回退链/熔断/能力降级（Anthropic/Gemini 适配器）；Skill registry + 表权限沙箱 + 规则；
  前端 角色生成器/世界观/Codex/规则页/技能库/⌘K 命令面板。
K1（Kimi Code 订阅接入）: OAuth device-flow（kimi-code）+ 静态 Console key（kimi-code-key）两路径；
  coding 端点 KimiCLI 伪造头（实测 UA allow-list 门禁，缺则 403）+ JSON 模式结构化（thinking ⊥ tool_choice）。
本地联调修复: CORS 中间件；assemble 注入 premise+「写第N章」指令（修空 prompt 400）；
  GET /outline·/draft read-back + 大纲/工作台/审稿页重载；写页 client/server 常量边界 + notFound 健壮化；
  字数 toLocaleString locale 水合；审稿页终稿从已存草稿 seed（修 accept 422）。
门禁: backend ruff/mypy(157)/alembic 无漂移/pytest 451 · frontend lint/tsc/vitest/build。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/web/lib/api/server.test.ts

@@ -0,0 +1,68 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { fetchDraft, fetchOutline } from "./server";
+
+// 纯加载/降级逻辑（mock fetch，无网络/DOM）：大纲解包/降级、草稿 404→null。
+function mockFetch(status: number, body: unknown): void {
+  vi.stubGlobal(
+    "fetch",
+    vi.fn(async () =>
+      new Response(JSON.stringify(body), {
+        status,
+        headers: { "content-type": "application/json" },
+      }),
+    ),
+  );
+}
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
+
+describe("fetchOutline", () => {
+  it("returns the persisted chapters on 200", async () => {
+    mockFetch(200, { chapters: [{ no: 1, volume: 1, beats: ["开场"] }] });
+
+    const chapters = await fetchOutline("p1");
+
+    expect(chapters).toHaveLength(1);
+    expect(chapters[0].no).toBe(1);
+  });
+
+  it("returns empty array when the project has no outline", async () => {
+    mockFetch(200, { chapters: [] });
+
+    expect(await fetchOutline("p1")).toEqual([]);
+  });
+
+  it("falls back to empty array on any error (does not throw)", async () => {
+    mockFetch(404, { error: { code: "NOT_FOUND", message: "no project" } });
+
+    expect(await fetchOutline("missing")).toEqual([]);
+  });
+});
+
+describe("fetchDraft", () => {
+  it("returns the saved draft view on 200", async () => {
+    mockFetch(200, {
+      project_id: "p1",
+      chapter_no: 1,
+      volume: 1,
+      status: "draft",
+      version: 2,
+      content: "第一章正文",
+      length: 5,
+    });
+
+    const draft = await fetchDraft("p1", 1);
+
+    expect(draft?.content).toBe("第一章正文");
+    expect(draft?.version).toBe(2);
+  });
+
+  it("returns null when no draft exists (404 → empty editor)", async () => {
+    mockFetch(404, { error: { code: "NOT_FOUND", message: "no draft" } });
+
+    expect(await fetchDraft("p1", 9)).toBeNull();
+  });
+});