feat: implement v1 consumer API endpoints with runtime_id support (REQ-004~010)

- Generate runtime_id for service-token issuance (CLI and API)
- Implement GET /v1/assets endpoint with asset view and strategy_params
- Implement GET /v1/user_info endpoint with trading_enabled and broker credentials
- Implement POST /v1/assets/{asset_id}/ledger/trades with idempotency support
- Update auth service to support runtime_id tracking and credential encryption
- Add comprehensive test coverage for v1 endpoints (dcy-002 implementation)
- Update postgres repository for ledger and broker credential queries
- Ensure all tests pass for feature validation

app/cli/commands/service_tokens.py

@@ -78,6 +78,7 @@ def issue_service_token(
         name=name,
         expires_at=issued.auth_token.expires_at,
         revoked=issued.auth_token.revoked_at is not None,
+        runtime_id=issued.auth_token.runtime_id,
         token=issued.token,
     )
     render_service_token_result(ctx.obj.console, ctx.obj.output_format, response)