fix(docker): add missing workspace members and SQLX_OFFLINE to all Dockerfiles

All 6 service Dockerfiles were missing newly-added workspace crates
(web-gateway, ctrader-openapi, foxhunt-deploy, broker_gateway_service),
causing cargo workspace resolution failures during Docker builds.

Changes across all Dockerfiles:
- Add COPY directives for web-gateway, ctrader-openapi, foxhunt-deploy,
  broker_gateway_service (new workspace members since Dockerfiles written)
- Add SQLX_OFFLINE=true env and .sqlx cache copy where missing
- Add perl and make system deps (needed for OpenSSL build from source)
- Remove COPY migrations (dir excluded by .dockerignore, not needed)
- Expand broker_gateway_service from 3-crate to full workspace copy

Validated: docker build --check passes all 6, cargo check -p passes all 6.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

services/backtesting_service/Dockerfile

@@ -11,6 +11,8 @@ RUN apt-get update && apt-get install -y \
     pkg-config \
     libssl-dev \
     protobuf-compiler \
+    perl \
+    make \
     && rm -rf /var/lib/apt/lists/*
 
 # Set working directory
@@ -24,6 +26,9 @@ ENV CUDA_COMPUTE_CAP=86
 # Copy workspace manifests
 COPY Cargo.toml Cargo.lock ./
 
+# Copy sqlx offline cache for compile-time query verification
+COPY .sqlx ./.sqlx
+
 # Copy workspace members to satisfy manifest dependencies
 COPY trading_engine ./trading_engine
 COPY risk ./risk
@@ -41,7 +46,11 @@ COPY model_loader ./model_loader
 COPY market-data ./market-data
 COPY database ./database
 COPY config ./config
+COPY web-gateway ./web-gateway
+COPY ctrader-openapi ./ctrader-openapi
+COPY foxhunt-deploy ./foxhunt-deploy
 COPY services/backtesting_service ./services/backtesting_service
+COPY services/broker_gateway_service ./services/broker_gateway_service
 COPY services/trading_service ./services/trading_service
 COPY services/ml_training_service ./services/ml_training_service
 COPY services/data_acquisition_service ./services/data_acquisition_service
@@ -51,7 +60,9 @@ COPY services/load_tests ./services/load_tests
 COPY services/stress_tests ./services/stress_tests
 COPY services/integration_tests ./services/integration_tests
 COPY tests ./tests
-COPY migrations ./migrations
+
+# Enable sqlx offline mode to use cached query metadata
+ENV SQLX_OFFLINE=true
 
 # Build the application
 RUN cargo build --release -p backtesting_service