refactor: create docker-stack workspace for deployment configs

Created dedicated workspace for Docker deployment configurations and scripts.
Improves organization by grouping all deployment-related files together.

## New Structure
- docker-stack/: Docker Compose files and deployment scripts
  - docker-compose-standalone.yaml
  - docker-compose-swarm.yml
  - docker-compose-debug.yml
  - deploy-standalone.sh
  - deploy-swarm.sh
  - README.md (deployment documentation)
  - package.json

## Changes
- Moved all docker-compose YAML files to docker-stack/
- Moved deploy scripts to docker-stack/
- Updated VS Code workspace to include docker-stack
- Updated documentation (README, CLAUDE.md)

## Deployment Workflow
1. Build: `cd web-app && ./build.sh 2.20.0`
2. Deploy: `cd docker-stack && ./deploy-standalone.sh 2.20.0`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -6,6 +6,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 This is a multi-project repository containing:
 - **web-app/**: Next.js 14 utility bills tracking application
+- **docker-stack/**: Docker Compose configurations and deployment scripts
 - **housekeeping/**: Database backup and maintenance scripts
 
 Each project is self-contained with its own dependencies.
@@ -30,10 +31,10 @@ All commands should be run from within the respective project directory.
 
 ## Deployment Commands
 
-**Building Docker Image** (from web-app directory):
-- `cd web-app && ./build.sh <version>` - Build Docker image
+**Building Docker Image** (`cd web-app`):
+- `./build.sh <version>` - Build Docker image
 
-**Deploying** (from repository root):
+**Deploying** (`cd docker-stack`):
 - `./deploy-standalone.sh <version>` - Deploy with docker-compose (standalone)
 - `./deploy-swarm.sh <version>` - Deploy with Docker Swarm