feat: add DomainSession and DepositSession types

- Add type definitions for domain and deposit agent sessions
- Follow existing ServerSession pattern

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/types.ts

@@ -295,6 +295,52 @@ export interface TroubleshootSession {
   updatedAt: number;
 }
 
+// Domain Agent Session Status
+export type DomainSessionStatus =
+  | 'gathering'    // 정보 수집 중 (추천용 키워드, 용도)
+  | 'suggesting'   // 추천 결과 표시 중
+  | 'confirming'   // 등록 확인 대기
+  | 'setting_ns'   // 네임서버 변경 확인 대기
+  | 'completed';   // 완료
+
+// Domain Agent Session
+export interface DomainSession {
+  user_id: string;
+  status: DomainSessionStatus;
+  collected_info: {
+    keywords?: string;
+    purpose?: string;
+    budget?: number;
+    preferred_tlds?: string[];
+  };
+  target_domain?: string;
+  messages: Array<{ role: 'user' | 'assistant'; content: string }>;
+  created_at: number;
+  updated_at: number;
+  expires_at: number;
+}
+
+// Deposit Agent Session Status
+export type DepositSessionStatus =
+  | 'collecting_amount'    // 금액 수집 중
+  | 'collecting_name'      // 입금자명 수집 중
+  | 'confirming'           // 입금 신고 확인 대기
+  | 'completed';           // 완료
+
+// Deposit Agent Session
+export interface DepositSession {
+  user_id: string;
+  status: DepositSessionStatus;
+  collected_info: {
+    amount?: number;
+    depositor_name?: string;
+  };
+  messages: Array<{ role: 'user' | 'assistant'; content: string }>;
+  created_at: number;
+  updated_at: number;
+  expires_at: number;
+}
+
 // Deposit Agent 결과 타입
 export interface DepositBalanceResult {
   balance: number;