refactor(B04): B04_wf1_Surface -> B04_PreProcess 전면 개명

- 폴더·내부 파일 51개 접두사 개명 (git mv, 이력 보존)
- 저장소 전체 참조 치환 67파일: import 경로, 라우트 슬러그(b04-preprocess),
  라우트 키(B04_PREPROCESS), storage 경로 상수, locale, SQL 주석
- 로직 변경 없음 (기계적 치환). typecheck·백엔드 import 검증 통과

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

A00_Common/b_asset_cache.ts

@@ -10,7 +10,7 @@
  * ========================================================================== */
 
 import { API_BASE_URL } from "@config/config_frontend";
-import { fetchConfirmedSurface } from "../B04_wf1_Surface/B04_wf1_Surface_Api_Fetch";
+import { fetchConfirmedSurface } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 
 const DB_NAME = "aislo-asset-cache";
 // 담아 둔 자료의 형식이나 내용이 바뀌면 이 번호를 올린다 — 올리면 기존 보관분을 통째로 버린다.

A00_Common/b_workflow_nav.ts

@@ -5,7 +5,7 @@ import {
   type RoutePath,
 } from "@config/config_frontend";
 import type { WorkflowStage } from "@ui/ui_template_workflow_layout";
-import { fetchConfirmedSurface } from "../B04_wf1_Surface/B04_wf1_Surface_Api_Fetch";
+import { fetchConfirmedSurface } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
 import { isProjectPreloaded, setPreloadTarget } from "./b_asset_cache";
 import { navigateTo } from "./router";
 
@@ -17,7 +17,7 @@ export interface WorkflowState {
 
 export const WORKFLOW_STEP_ROUTES: readonly RoutePath[] = [
   ROUTES.B03_FILE_INPUT,
-  ROUTES.B04_WF1_SURFACE,
+  ROUTES.B04_PREPROCESS,
   ROUTES.B05_WF2_ROUTE,
   ROUTES.B06_WF3_PROFILE_CROSS,
   ROUTES.B07_WF4_DESIGN_DETAIL,

A00_Common/main.ts

@@ -18,7 +18,7 @@ const FOOTERLESS_ROUTES: readonly RoutePath[] = [
   ROUTES.B01_ACCOUNT,
   ROUTES.B02_PROJ_REGISTER,
   ROUTES.B03_FILE_INPUT,
-  ROUTES.B04_WF1_SURFACE,
+  ROUTES.B04_PREPROCESS,
   ROUTES.B05_WF2_ROUTE,
   ROUTES.B06_WF3_PROFILE_CROSS,
   ROUTES.B07_WF4_DESIGN_DETAIL,

A00_Common/router.ts

@@ -39,8 +39,8 @@ const routeTable: Partial<Record<RoutePath, () => Promise<PageRenderer>>> = {
     (await import("../B02_ProjRegister/B02_ProjRegister_UI_Page")).renderB02ProjRegister,
   [ROUTES.B03_FILE_INPUT]: async () =>
     (await import("../B03_FileInput/B03_FileInput_UI_Page")).renderB03FileInput,
-  [ROUTES.B04_WF1_SURFACE]: async () =>
-    (await import("../B04_wf1_Surface/B04_wf1_Surface_UI_Page")).renderB04Surface,
+  [ROUTES.B04_PREPROCESS]: async () =>
+    (await import("../B04_PreProcess/B04_PreProcess_UI_Page")).renderB04Surface,
   [ROUTES.B05_WF2_ROUTE]: async () =>
     (await import("../B05_wf2_Route/B05_wf2_Route_UI_Page")).renderB05Route,
   [ROUTES.B06_WF3_PROFILE_CROSS]: async () =>
@@ -106,7 +106,7 @@ export async function renderCurrentRoute(outlet: HTMLElement): Promise<void> {
   const workflowRoutes: readonly RoutePath[] = [
     ROUTES.B02_PROJ_REGISTER,
     ROUTES.B03_FILE_INPUT,
-    ROUTES.B04_WF1_SURFACE,
+    ROUTES.B04_PREPROCESS,
     ROUTES.B05_WF2_ROUTE,
     ROUTES.B06_WF3_PROFILE_CROSS,
     ROUTES.B07_WF4_DESIGN_DETAIL,