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

backend/scripts/health-check.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Health check script for Docker container
+# Returns exit code 0 if healthy, 1 if unhealthy
+
+# Check if API is responding
+if ! wget --spider -q http://localhost:3001/api/v1/health 2>/dev/null; then
+  echo "API health endpoint not responding"
+  exit 1
+fi
+
+# Check database connection and data
+USER_COUNT=$(PGPASSWORD=$DATABASE_PASSWORD psql -h "$DATABASE_HOST" -U "$DATABASE_USER" -d "$DATABASE_NAME" -tAc "SELECT COUNT(*) FROM users;" 2>/dev/null || echo "0")
+
+if [ "$USER_COUNT" -eq "0" ]; then
+  echo "Database has no users"
+  exit 1
+fi
+
+echo "Health check passed: API responding, $USER_COUNT users in database"
+exit 0