* feat(auth): add import functionality for existing OpenAI Codex auth profiles
Introduces a new command-line option to import an existing `auth.json` file for OpenAI Codex, allowing users to bypass the login flow. The import feature reads and parses the specified JSON file, extracting authentication tokens and storing them in the user's profile. This change enhances user experience by simplifying the authentication process for existing users.
- Added `import` option to `AuthCommands` enum
- Implemented `import_openai_codex_auth_profile` function to handle the import logic
- Updated `handle_auth_command` to process the import option and validate provider compatibility
- Ensured that the import feature is exclusive to the `openai-codex` provider
* feat(auth): extract expiry from JWT in OpenAI Codex import
Enhances the `import_openai_codex_auth_profile` function by extracting the expiration date from the JWT access token. This change allows for more accurate management of token lifetimes by replacing the hardcoded expiration date with a dynamic value derived from the token itself.
- Added `extract_expiry_from_jwt` function to handle JWT expiration extraction
- Updated `TokenSet` to use the extracted expiration date instead of a static value
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