Migration from env to envsh

[TsybulkaM]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the project from using python-dotenv to envsh for environment variable management, changing from .env files to .sh files for environment configuration.

Key changes:

• Replace python-dotenv dependency with envsh library across all Python files
• Update environment variable loading from load_dotenv() to envsh.load() with search paths
• Replace os.getenv() calls with envsh.read_env() with type specification
• Update Django settings module references to use development-specific settings

Reviewed Changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pyproject.toml	Remove python-dotenv dependency and add envsh, update Python version requirement
route_engine/route_engine/settings/base.py	Replace dotenv with envsh for environment loading and variable reading
route_engine/route_engine/settings/prod.py	Simplify ALLOWED_HOSTS configuration by replacing conditional logic with static list
route_engine/manage.py	Update default Django settings module to development settings
logicway/routing/views.py	Replace dotenv with envsh and remove Russian comment
logicway/map/views.py	Replace dotenv with envsh for environment variable handling
logicway/logicway/settings/prod.py	Simplify ALLOWED_HOSTS and remove CORS_ALLOWED_ORIGINS configuration
logicway/logicway/settings/base.py	Replace dotenv with envsh and update database configuration
logicway/database/tests/models_database_test.py	Update environment loading and add missing test data setup
logicway/database/tests/AJAX_test.py	Replace dotenv with envsh and update test URLs to use environment variable
logicway/database/load_data.py	Replace dotenv with envsh for database configuration
logicway/database/fetch_data_and_convert_to_json.py	Replace dotenv with envsh for database configuration
logicway/database/database.py	Replace dotenv with envsh for database configuration
frontend/package.json	Update start script to source environment shell script
README.md	Update documentation to reflect migration from .env to .sh files

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