feat: Runtime configuration and Docker deployment improvements

Frontend:
- Add runtime configuration service for deployment-time API URL injection
- Create docker-entrypoint.sh to generate config.json from environment variables
- Update ApiService, ApprovalService, and DocumentViewer to use RuntimeConfigService
- Add APP_INITIALIZER to load runtime config before app starts

Backend:
- Fix init-blockchain.js to properly quote mnemonic phrases in .env file
- Improve docker-entrypoint.sh with health checks and better error handling

Docker:
- Add API_BASE_URL environment variable to frontend container
- Update docker-compose.yml with clear documentation for remote deployment
- Reorganize .env.example with clear categories (REQUIRED FOR REMOTE, PRODUCTION, AUTO-GENERATED)

Workflow fixes:
- Fix DepartmentApproval interface to match backend schema
- Fix stage transformation for 0-indexed stageOrder
- Fix workflow list to show correct stage count from definition.stages

Cleanup:
- Move development artifacts to .trash directory
- Remove root-level package.json (was only for utility scripts)
- Add .trash/ to .gitignore

frontend/Dockerfile

@@ -1,3 +1,9 @@
+# ==============================================================================
+# Goa GEL Frontend - Multi-stage Docker Build
+# ==============================================================================
+# Supports runtime configuration via environment variables
+# ==============================================================================
+
 # Stage 1: Build Angular application
 FROM node:20-alpine AS builder
 
@@ -21,9 +27,13 @@ FROM nginx:alpine
 # Copy custom nginx configuration
 COPY nginx.conf /etc/nginx/nginx.conf
 
-# Copy built application from builder stage (from browser subdirectory)
+# Copy built application from builder stage
 COPY --from=builder /app/dist/goa-gel-frontend/browser /usr/share/nginx/html
 
+# Copy runtime config script
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+RUN chmod +x /docker-entrypoint.sh
+
 # Expose port 80
 EXPOSE 80
 
@@ -31,5 +41,6 @@ EXPOSE 80
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
   CMD wget --quiet --tries=1 --spider http://localhost/ || exit 1
 
-# Start nginx
+# Use entrypoint to inject runtime config
+ENTRYPOINT ["/docker-entrypoint.sh"]
 CMD ["nginx", "-g", "daemon off;"]