feat(api_gateway): add 6 gRPC proxy services + server codegen for all protos
Enable server codegen for trading, risk, config protos in build.rs.
Add new compile blocks for broker_gateway, data_acquisition, ml protos.
Create 6 zero-copy forwarding proxies following TradingAgentProxy pattern:
- TradingDirectProxy (trading.TradingService, 16 RPCs)
- RiskServiceProxy (risk.RiskService, 8 RPCs)
- BrokerGatewayProxy (broker_gateway.BrokerGatewayService, 7 RPCs)
- DataAcquisitionProxy (data_acquisition.DataAcquisitionService, 5 RPCs)
- MlServiceProxy (ml.MLService, 10 RPCs)
- ConfigServiceProxy (config.ConfigService, 12 RPCs)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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