Create comprehensive docker-compose.yml project for Weblate with standardized syntax

[Copilot]

This PR enhances the existing Weblate docker-compose project to fully comply with Websoft9 standards and implement all requirements from the development checklist.

Key Enhancements

Architecture & Standardization

• 3-container setup: Weblate main application, PostgreSQL 17-alpine database, Redis 8-alpine cache
• Health checks: Implemented for all services with proper intervals, timeouts, and retry logic
• Service dependencies: Added proper depends_on with health check conditions for reliable startup ordering
• Logging configuration: Added JSON file driver with rotation limits (5 files, 10MB max)
• Network compliance: Uses external websoft9 network following repository standards

Environment Variables & Configuration

• Comprehensive .env file: Added 25+ environment variables covering all Weblate features
• Database connection: Complete PostgreSQL connection string configuration
• Cache configuration: Redis connection settings for optimal performance
• Security settings: Secret key, allowed hosts, and authentication configuration
• Internationalization: Timezone (UTC) and i18n settings for global usage
• SMTP template: Ready-to-use email configuration for notifications

Proxy & Networking

• nginx_proxy.conf: Added reverse proxy configuration with WebSocket support for real-time translation features
• Port configuration: Internal port 8080 mapped to configurable external port (default 9001)
• Connection URIs: Proper database and cache connection strings

Documentation & Setup

• Enhanced Notes.md: Comprehensive setup guide with configuration examples
• CHANGELOG.md: Documented all enhancements and improvements
• Fixed variables.json: Corrected Docker Hub URL for version tracking

Configuration Example

The setup provides a complete translation management platform with:

services:
  weblate:
    image: weblate/weblate:5
    depends_on:
      cache:
        condition: service_healthy
      database:
        condition: service_healthy
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8080/healthz/"]

Environment variables include database connection (postgresql://weblate:password@weblate-db/weblate), cache settings, admin credentials, and optional SMTP configuration for email notifications.

Testing & Validation

• Docker compose configuration syntax validated successfully
• Environment variable expansion verified
• Health check patterns consistent with other repository applications
• Network and volume configurations confirmed working

Fixes #1558.

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