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/style/useStyleLearn.ts

@@ -0,0 +1,123 @@
+"use client";
+
+import { useCallback, useEffect, useRef, useState } from "react";
+
+import { api } from "@/lib/api/client";
+import { useToast } from "@/components/Toast";
+import type { StyleFingerprintResponse } from "@/lib/api/types";
+import { useJobPoll } from "@/lib/jobs/useJobPoll";
+import { styleLearnResult } from "@/lib/jobs/job";
+import {
+  buildLearnRequest,
+  normalizeFingerprint,
+  type Fingerprint,
+  type StyleLearnMode,
+} from "./style";
+
+export interface UseStyleLearn {
+  // 提交中（POST /style 受理）或轮询中。
+  busy: boolean;
+  pollStatus: ReturnType<typeof useJobPoll>["status"] | "idle";
+  progress: number;
+  fingerprint: Fingerprint | null;
+  // 学文风：POST /style → 拿 job_id → 轮询 → done 后拉最新指纹。
+  learn: (
+    projectId: string,
+    samples: string[],
+    mode: StyleLearnMode,
+  ) => Promise<boolean>;
+}
+
+function errorCode(error: unknown): string | undefined {
+  if (typeof error !== "object" || error === null) return undefined;
+  const env = error as { error?: { code?: unknown } };
+  return typeof env.error?.code === "string" ? env.error.code : undefined;
+}
+
+// 学文风编排：受理（202 job_id）→ useJobPoll 轮询 → done 拉 GET /style 展示指纹。
+export function useStyleLearn(initial: Fingerprint | null): UseStyleLearn {
+  const [fingerprint, setFingerprint] = useState<Fingerprint | null>(initial);
+  const [submitting, setSubmitting] = useState(false);
+  const [pollStatus, setPollStatus] = useState<
+    ReturnType<typeof useJobPoll>["status"] | "idle"
+  >("idle");
+  const [projectId, setProjectId] = useState<string | null>(null);
+  const poll = useJobPoll();
+  const toast = useToast();
+  // 仅在提交过一次学文风后才反映轮询状态（initialPollState.status 默认 "polling"）。
+  const startedRef = useRef(false);
+
+  // 轮询完成 → 拉最新指纹；失败 → toast。
+  useEffect(() => {
+    if (!startedRef.current) return;
+    setPollStatus(poll.status);
+    if (poll.status === "done" && projectId) {
+      void refetchFingerprint(projectId).then((fp) => {
+        if (fp) setFingerprint(fp);
+        toast("文风指纹已更新。", "success");
+      });
+    }
+    if (poll.status === "error") {
+      toast(`学文风失败：${poll.error ?? "未知原因"}`, "error");
+    }
+    // 仅在 poll.status 变化时反应。
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [poll.status]);
+
+  const learn = useCallback<UseStyleLearn["learn"]>(
+    async (pid, samples, mode) => {
+      setSubmitting(true);
+      setProjectId(pid);
+      try {
+        const { data, error } = await api.POST("/projects/{project_id}/style", {
+          params: { path: { project_id: pid } },
+          body: buildLearnRequest(samples, mode),
+        });
+        if (error || !data) {
+          const code = errorCode(error);
+          toast(
+            code === "LLM_UNAVAILABLE"
+              ? "未配置提供商，请先去设置页连一家。"
+              : "学文风受理失败，请稍后重试。",
+            "error",
+          );
+          return false;
+        }
+        startedRef.current = true;
+        poll.poll(data.job_id);
+        setPollStatus("polling");
+        return true;
+      } finally {
+        setSubmitting(false);
+      }
+    },
+    [poll, toast],
+  );
+
+  return {
+    busy: submitting || pollStatus === "polling",
+    pollStatus,
+    progress: poll.progress,
+    fingerprint,
+    learn,
+  };
+}
+
+// 客户端拉最新指纹（done 后刷新展示）；404/失败 → null。
+async function refetchFingerprint(
+  projectId: string,
+): Promise<Fingerprint | null> {
+  const { data, error } = await api.GET("/projects/{project_id}/style", {
+    params: { path: { project_id: projectId } },
+  });
+  if (error || !data) return null;
+  return normalizeFingerprint(data as StyleFingerprintResponse);
+}
+
+// 仅供测试/复用：保证 job done result 的版本回显（不阻断 UI）。
+export function learnSummary(
+  poll: ReturnType<typeof useJobPoll>,
+): { version: number | null; dimsCount: number | null } | null {
+  if (poll.status !== "done" || !poll.job) return null;
+  return styleLearnResult(poll.job);
+}