refactor: saasMode 분기 제거 — 항상 SaaS(OAuth only)로 동작

Mac/Windows 환경 불일치 해소. BUILD_TIME 상수, CONFIGURE 채널,
개발자 모드 UI 전부 제거. Supabase 설정은 supabase-config.ts SSOT.

apps/desktop/src/main/services/CloudSyncService.ts

@@ -13,7 +13,8 @@ import {
 } from '@supabase/supabase-js'
 import { eq, gt } from 'drizzle-orm'
 import { getLogger } from './LoggerService'
-import { configGet, isSupabaseBuildTimeConfigured } from './ConfigService'
+import { configGet } from './ConfigService'
+import { SUPABASE_URL, SUPABASE_ANON_KEY } from '@d3ro/core/supabase-config'
 import { getDatabase, openForUser, openLocal, closeCurrent } from '../db'
 import { history, dictionary, meetingSessions, meetingMemos, meetingDocuments } from '../db/schema'
 import { D3ROError, ErrorCode } from '@d3ro/core/errors'
@@ -41,11 +42,6 @@ interface CloudSyncState {
   userEmail: string | null
   lastSyncAt: number | null
   syncing: boolean
-  /**
-   * SaaS 빌드 타임 모드: Supabase URL/Key가 빌드 시점에 박혀있는지 여부.
-   * true이면 사용자는 OAuth 로그인만 하면 됨 (URL/Key 입력 화면 노출 금지).
-   */
-  saasMode: boolean
 }
 
 interface CloudSyncEvents {
@@ -78,15 +74,7 @@ class CloudSyncService extends EventEmitter {
     if (this._initialized) return
     this._initialized = true
 
-    const url = configGet('supabaseUrl') as string | undefined
-    const anonKey = configGet('supabaseAnonKey') as string | undefined
-
-    if (!url || !anonKey) {
-      logger.info('CloudSync disabled — Supabase URL/key not configured')
-      return
-    }
-
-    this._client = createClient(url, anonKey, {
+    this._client = createClient(SUPABASE_URL, SUPABASE_ANON_KEY, {
       auth: {
         persistSession: false, // 직접 관리
         autoRefreshToken: true,
@@ -486,8 +474,7 @@ class CloudSyncService extends EventEmitter {
       authenticated: this.isAuthenticated(),
       userEmail: this._session?.user?.email ?? null,
       lastSyncAt: this._lastSyncAt,
-      syncing: this._syncing,
-      saasMode: isSupabaseBuildTimeConfigured()
+      syncing: this._syncing
     }
   }