feat(backend): complete modular monolith with ledger, fastapi and websocket

app/schemas/dtos.py

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+from pydantic import BaseModel, Field
+from typing import List, Optional, Dict, Any
+from decimal import Decimal
+from datetime import datetime
+
+class UserAuthRequest(BaseModel):
+    address: str = Field(..., description="EVM 钱包地址")
+    signature: str = Field(..., description="签名")
+    message: str = Field(..., description="SIWE 原始签名消息")
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    address: str
+
+class AccountBalanceDTO(BaseModel):
+    address: str
+    collateral_symbol: str
+    available_balance: Decimal
+    frozen_balance: Decimal
+
+class LedgerEntryDTO(BaseModel):
+    id: int
+    entry_type: str
+    amount: Decimal
+    balance_after: Decimal
+    frozen_after: Decimal
+    related_market: Optional[str] = None
+    created_at: datetime
+
+class CreateMarketRequest(BaseModel):
+    title: str
+    description: Optional[str] = None
+    category: str = "Crypto"
+    tier: int = 1
+    resolution_time: datetime
+    outcomes: List[str] = Field(..., min_length=2, max_length=8)
+
+class MarketDTO(BaseModel):
+    market_address: str
+    question_id: str
+    title: str
+    description: Optional[str] = None
+    category: str
+    tier: int
+    creator: str
+    status: str
+    outcomes: List[str]
+    winning_outcome: Optional[int] = None
+    resolution_time: datetime
+    created_at: datetime
+
+class CreateOrderRequest(BaseModel):
+    market_address: str
+    outcome_index: int = Field(..., ge=0, le=7)
+    side: str = Field(..., pattern="^(BUY|SELL)$")
+    amount: Decimal = Field(..., gt=0)
+    price: Optional[Decimal] = None
+
+class OrderDTO(BaseModel):
+    order_id: str
+    market_address: str
+    user_address: str
+    side: str
+    outcome_index: int
+    amount: Decimal
+    status: str
+    fee: Decimal
+    created_at: datetime