Allow token add to accept pre-generated tokens

[abrookins]

Add support for providing a pre-generated token value to the token add CLI command.

• Introduce a new --token option for agent-memory token add
• Reuse existing hashing, storage, and expiration logic for provided tokens
• Preserve existing behavior when --token is not specified (token is generated as before)
• Integrate provided tokens with the existing JSON output mode (token field reflects the provided value)
• Add tests to verify behavior and ensure generate_token is not called when --token is supplied

[Copilot]

Pull Request Overview

This PR adds support for pre-generated tokens in the agent-memory token add CLI command, along with JSON output format support for token management commands.

• Introduces a new --token option to accept pre-generated token values instead of auto-generating them
• Adds --format option (text/json) to all token management commands (add, list, show) for programmatic consumption
• Refactors command logic to return data structures that can be formatted as JSON or text

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
agent_memory_server/cli.py	Adds --token and --format options to token commands; refactors add/list/show commands to support both text and JSON output formats
tests/test_token_cli.py	Adds comprehensive tests for JSON output mode and pre-generated token functionality across add, list, and show commands

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