Claude Code: Fix ENV_INJECTION - source .env in entrypoint, add OPENROUTER_API_KEY

- Add .env loading in entrypoint.sh before starting processes
- Add OPENROUTER_API_KEY placeholder to .env (used by openclaw.json)
- Fixes worker initialization by ensuring env vars are available

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

entrypoint.sh

@@ -23,6 +23,14 @@ echo "=========================================="
 # Change to app directory
 cd /app
 
+# Load .env file if it exists (for local development)
+if [ -f "/app/.env" ]; then
+    echo "Loading .env file..."
+    set -a  # Automatically export all variables
+    source /app/.env
+    set +a
+fi
+
 # Set data directory to dataset mount point
 export OPENCLAW_DATA_DIR=/data