feat: audit logging

[killme2008]

• Adds audit logging for all MCP commands, close Audit log for commands #26
• Prepare to release v0.4.0
• Updated docs

[Copilot]

Pull request overview

This PR adds comprehensive audit logging functionality for all MCP tool invocations to support security auditing and compliance requirements. The feature is configurable via environment variable or CLI flag and is enabled by default.

Key Changes:

• Implemented audit logging functions that capture tool name, parameters (truncated), success/failure status, duration, and error details
• Added a hook mechanism that wraps the MCP tool manager to intercept all tool calls
• Extended configuration with audit_enabled boolean parameter (default: true)

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/greptimedb_mcp_server/utils.py	Adds audit logging functions: audit_log, _truncate_value, and _format_audit_params for formatting and recording audit entries
src/greptimedb_mcp_server/server.py	Implements _install_audit_hook() that wraps the tool manager's call_tool method to log all invocations with timing
src/greptimedb_mcp_server/config.py	Adds audit_enabled boolean configuration parameter with CLI and environment variable support
tests/test_server.py	Updates test fixture to disable audit logging during tests
src/greptimedb_mcp_server/__init__.py	Adds exception handlers for KeyboardInterrupt and asyncio.CancelledError for graceful shutdown
README.md	Documents the audit logging feature with examples, log format, and configuration options
pyproject.toml	Bumps version from 0.3.1 to 0.4.0 to reflect the new feature

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