fix: hardcode pip extras in Dockerfile to avoid buildx arg parsing issues

The woodpeckerci/plugin-docker-buildx was not passing the EXTRAS build
arg correctly (commas in the value were likely being parsed as list
separators), causing the image to only install dev dependencies instead
of all service extras (api, news, sentiment, trading, backtester).

Hardcode the pip install extras directly in the Dockerfile rather than
relying on the build arg.

.woodpecker.yml

@@ -41,7 +41,6 @@ steps:
       dockerfile: docker/Dockerfile.service
       context: .
       build_args:
-        - EXTRAS=api,news,sentiment,trading,backtester
         - SERVICE_MODULE=api_gateway
       tags:
         - "${CI_PIPELINE_NUMBER}"

docker/Dockerfile.service

@@ -18,8 +18,8 @@ COPY backtester/ backtester/
 COPY alembic/ alembic/
 COPY alembic.ini .
 
-ARG EXTRAS="dev"
-RUN pip install --no-cache-dir ".[$EXTRAS]" && pip install --no-cache-dir curl_cffi 2>/dev/null || true
+# Install all service dependencies (hardcoded to avoid build-arg comma parsing issues)
+RUN pip install --no-cache-dir ".[api,news,sentiment,trading,backtester]" && pip install --no-cache-dir curl_cffi 2>/dev/null || true
 
 # ---------------------------------------------------------------------------
 # Stage 2: slim runtime image