docs: add Codex CLI instructions and clarify .env auto-loading

[seaniedan-flwls]

Summary

Documentation updates following the merged .env auto-loading feature.

Changes

1. Updated Step 2 (Get OAuth2 Access Token)

Now shows the recommended approach of creating a .env file:

TICKTICK_CLIENT_ID=your_client_id
TICKTICK_CLIENT_SECRET=your_client_secret

Then simply running ticktick-sdk auth - the CLI now auto-loads the .env file.

2. Added Codex CLI Instructions

Added configuration instructions for OpenAI Codex CLI, which also supports MCP servers:

codex mcp add ticktick \
  --env TICKTICK_CLIENT_ID=your_client_id \
  ...
  -- ticktick-sdk

This sits alongside the existing Claude Code and Claude Desktop instructions.

Why

• The .env approach is cleaner than inline environment variables
• Codex CLI is gaining popularity and has full MCP support
• Both changes make the SDK more accessible to users

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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