feat(docker): add multi-stage Dockerfile, CI/CD pipeline, and product…

[Scarage1]

…ion stack

• Multi-stage Dockerfile: Node 22 (frontend build) → Python 3.11-slim (production)
• Non-root user (appuser:1001), HEALTHCHECK, layer-optimized caching
• docker-entrypoint.sh: Alembic migrations + gunicorn with uvicorn workers
• docker-compose.prod.yml: app + postgres:16 + redis:7 with health checks
• .github/workflows/docker-deploy.yml: test → build (GHCR) → deploy (Azure)
• Pin all Python dependencies to exact versions (== instead of >=)
• Remove Azure-specific path detection from src/config.py
• Archive old Oryx-based deploy-azure.yml workflow
• Add .env.production.example with documented env vars
• Add .dockerignore to minimize build context

Description

Type of Change

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor
• 📝 Documentation
• 🧪 Tests
• 🔧 Config / CI

Phase

• Phase 1: Foundation (DB, Async, Auth)
• Phase 2: Core UX (Tabs, Collections, Request Builder)
• Phase 3: Environments & Variables
• Phase 4: Scripting & Assertions
• Phase 5: Advanced Features
• Phase 6: Collaboration & Polish

Changes

Testing

• Backend tests pass (pytest)
• Frontend tests pass (npm test)
• Manual testing done
• CI/CD pipeline passes

Screenshots