Add Docker development environment for BackOffice

[Copilot]

Implements Docker-based local development setup for BackOffice, matching the FrontOffice pattern but simplified for BackOffice's architecture.

Implementation

Infrastructure

• Dockerfile: Ubuntu 22.04, PHP 8.1, Apache, Node.js 15, Composer, Xdebug
• docker-compose.dev.yml: 2 services (app + MariaDB 10.11)
• docker-entrypoint.sh: Automated initialization - dependencies, database bootstrap, frontend builds
• Named volumes for vendor/ and node_modules/ performance optimization

Developer Tools

• docker-dev.sh: Wrapper commands (start, stop, logs, shell, db, reset)
• README.docker.md: Comprehensive workflow guide
• INSTALL/INSTALL.docker.md: Quick reference

Security

• Uses MYSQL_PWD environment variable to avoid password exposure in process lists
• Consistent utf8mb4 charset across all database operations

Usage

./docker-dev.sh start
# Access http://localhost:5002

Key Differences from FrontOffice

• Simpler: No stats service (PostgreSQL), no mailcatcher
• Uses ng_backoffice instead of ng_client
• Uses monarc_master database instead of monarc_cli
• Port 5002 (vs FrontOffice's 5001)

Service	Port	Purpose
monarc	5002	PHP/Apache application
db	3306	MariaDB 10.11

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dockerized BackOffice</issue_title>
<issue_description>We need to be able to run the application locally with docker-compose.dev.yml</issue_description>

<agent_instructions>The same way as it was currently done for the FrontOffice application, but here is more simple set of services.
monarc-project/MonarcAppFO#587</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Dockerized BackOffice #14

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