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/review/sse.ts

@@ -42,6 +42,18 @@ export interface PaceReport {
   beat_map: number[];
 }
 
+// 文风漂移（第四审，C4 扩 T4.2）：整体相似度 score + 段级漂移。
+export interface StyleDriftSegment {
+  idx: number;
+  score: number;
+  label: string | null;
+}
+
+export interface StyleDriftReport {
+  score: number;
+  segments: StyleDriftSegment[];
+}
+
 export interface SectionEvent {
   event: "section";
   data: { name: string; status: SectionStatus };
@@ -68,6 +80,17 @@ export interface PaceEvent {
     beat_map: number[];
   };
 }
+export interface StyleEvent {
+  event: "style";
+  data: {
+    score: number;
+    segments: {
+      idx: number;
+      score: number;
+      label?: string | null;
+    }[];
+  };
+}
 export interface DoneEvent {
   event: "done";
   data: { length: number };
@@ -81,6 +104,7 @@ export type ReviewSseEvent =
   | ConflictEvent
   | ForeshadowEvent
   | PaceEvent
+  | StyleEvent
   | DoneEvent
   | ErrorEvent;
 
@@ -89,6 +113,7 @@ const KNOWN_EVENTS = new Set([
   "conflict",
   "foreshadow",
   "pace",
+  "style",
   "done",
   "error",
 ]);
@@ -160,6 +185,7 @@ export interface ReviewStreamState {
   conflicts: ReviewConflict[];
   foreshadow: ForeshadowSuggestion[];
   pace: PaceReport | null;
+  style: StyleDriftReport | null;
   error: { code: string; message: string; request_id?: string | null } | null;
 }
 
@@ -169,6 +195,7 @@ export const initialReviewState: ReviewStreamState = {
   conflicts: [],
   foreshadow: [],
   pace: null,
+  style: null,
   error: null,
 };
 
@@ -202,6 +229,19 @@ export function reduceReview(
         phase: "reviewing",
         pace: { ...event.data },
       };
+    case "style":
+      return {
+        ...state,
+        phase: "reviewing",
+        style: {
+          score: event.data.score,
+          segments: event.data.segments.map((s) => ({
+            idx: s.idx,
+            score: s.score,
+            label: s.label ?? null,
+          })),
+        },
+      };
     case "done":
       return { ...state, phase: "done" };
     case "error":