feat: add environment file support and upgrade dependencies

[Au2mater]

New Features & Improvements

This PR introduces environment file support for automated deployments and upgrades key dependencies for better performance and compatibility.

Environment File Support

• New --env-file CLI parameter for automated configuration
• Comprehensive environment variable parsing with support for:
  • SQLITE_DB_PATH - SQLite database path
  • POSTGRES_HOST/PG_HOST - PostgreSQL host
  • POSTGRES_PORT/PG_PORT - PostgreSQL port
  • POSTGRES_DB/PG_DATABASE - Database name
  • POSTGRES_USER/PG_USER - Username
  • POSTGRES_PASSWORD/PG_PASSWORD - Password
• Flexible variable naming supporting both POSTGRES_* and PG_* prefixes
• Automatic validation of paths and database connections from environment
• Error handling with clear feedback for malformed or missing files

Technical Improvements

Dependency Upgrades:

• Upgraded psycopg2-binary → psycopg2 2.9.10 (better performance, reduced binary size)
• Upgraded rich → 14.0.0 (latest features and bug fixes)

Code Enhancements:

• New load_env_file() function for parsing environment files
• New get_config_from_env() function for extracting configuration
• Enhanced get_sqlite_config() and get_pg_config() to accept environment parameters
• Improved argument parsing with detailed help text and examples

[taylorwilsdon]

Love the idea, will get this pulled in

[Copilot]

Pull Request Overview

This PR adds support for loading configuration from an environment file and updates key dependencies for better performance.

• Introduces a --env-file CLI option with load_env_file() and get_config_from_env()
• Refactors database setup functions to accept environment parameters
• Switches from psycopg to psycopg2 and updates README with env-file usage

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
migrate.py	Added load_env_file, get_config_from_env, updated migrate signature to accept env inputs, and swapped psycopg → psycopg2
README.md	Documented environment-file mode in features list and configuration section, plus CLI examples

Comments suppressed due to low confidence (3)

README.md:14

• Replace the placeholder '�' with the intended emoji (for example, 🆕 or 📂) or remove it to correct the feature bullet.

- � **Environment file support for automated deployments**

README.md:105

• [nitpick] The code also supports POSTGRES_DATABASE as an alternative for the database name in get_config_from_env. Consider adding it here for completeness.

- `PG_HOST`, `PG_PORT`, `PG_DATABASE`, `PG_USER`, `PG_PASSWORD`

migrate.py:605

• Add unit tests for load_env_file and get_config_from_env to cover valid parsing, skipping malformed lines, missing files, and connection validation.

def load_env_file(env_file_path: Path) -> Dict[str, str]: