fix(api-proxy): add missing JS modules to Dockerfile COPY (#2950)

The OIDC refactoring PRs (#2811, #2772, #2887) added new JS modules
(github-oidc.js, aws-oidc-token-provider.js, gcp-oidc-token-provider.js,
oidc-refresh-utils.js) but did not update the Dockerfile COPY command.
This caused the api-proxy container to crash immediately on startup
with exit code 1 (Cannot find module './github-oidc'), breaking all
integration tests since commit 7c25298.

Fixes the api-proxy container startup crash that has been failing all
integration test runs on main since 2026-05-11T15:45Z.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

containers/api-proxy/Dockerfile

@@ -17,7 +17,9 @@ RUN npm ci --omit=dev
 # Copy application files
 COPY server.js logging.js metrics.js rate-limiter.js token-tracker.js \
      model-resolver.js proxy-utils.js anthropic-transforms.js \
-     proxy-request.js model-discovery.js management.js oidc-token-provider.js ./
+     proxy-request.js model-discovery.js management.js oidc-token-provider.js \
+     github-oidc.js aws-oidc-token-provider.js gcp-oidc-token-provider.js \
+     oidc-refresh-utils.js ./
 COPY providers/ ./providers/
 
 # Create non-root user