feat(REQ-005): implement TrEx Basic V1 API contract with auth, assets, ledger, and user endpoints

- Add V1 API routes for assets, ledger, and user info with complete CRUD operations
- Implement authentication scopes and request validation via auth_routes.py
- Extend schemas with V1-specific models for accounts, holdings, and positions
- Add database queries and aggregations for P&L, performance, and account data
- Include comprehensive test coverage for all V1 endpoints and integration flows
- Update batch and release documentation with implementation and verification evidence
- Sync project structure and runtime flows per V1 API contract requirements

Closes implementation phase of BAT-001 (TrEx Basic V1 API Contract)

app/schemas/v1.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from datetime import datetime
 from decimal import Decimal
-from typing import Literal
+from typing import Any, Literal
 
 from pydantic import BaseModel, Field
 
@@ -15,21 +15,22 @@ from pydantic import BaseModel, Field
 
 class AssetItem(BaseModel):
     asset_id: str
-    broker: str
-    market: str | None = None
     symbol: str
-    name: str
+    market: str | None = None
     status: str
-    cash_balance: float
-    asset_quantity: float
-    price: float
-    profit_buffer: float
-    active_strategy_id: str | None = None
-    available_strategies: list[str] | None = None
+    cash: float
+    quantity: float
+    broker_type: str
+    strategy_id: str | None = None
+    strategy_params: dict[str, Any] = {}
+    updated_at: datetime | None = None
+    # Additional informational fields
+    name: str | None = None
+    price: float | None = None
+    profit_buffer: float | None = None
     tags: list[str] | None = None
     owner_user_id: str | None = None
     created_at: datetime | None = None
-    updated_at: datetime | None = None
     last_trade_at: datetime | None = None
 
 
@@ -42,14 +43,24 @@ class AssetsResponse(BaseModel):
 # GET /v1/user_info
 # ---------------------------------------------------------------------------
 
+class BrokerItem(BaseModel):
+    broker: str
+    account_ref: str
+    credential_payload: dict[str, Any] | None = None
+    credential_version: int = 1
+    last_rotated_at: datetime | None = None
+
+
 class UserInfoResponse(BaseModel):
+    runtime_id: str
+    trading_enabled: bool
+    disabled_reason: str | None = None
+    brokers: list[BrokerItem] = []
+    # Additional informational fields
     user_id: str
     username: str
     email: str | None = None
     permission: str
-    is_active: bool
-    disabled_reason: str | None = None
-    runtime_id: str
 
 
 # ---------------------------------------------------------------------------
@@ -79,4 +90,4 @@ class LedgerTradeResponse(BaseModel):
     tax_amount: float
     executed_at: datetime
     recorded_at: datetime | None = None
-    created: bool
+    status: Literal["new", "duplicate"] = "new"