fix(docs): add missing imports in documentation code snippets

[sebpretzer]

Fixes: #285

Summary

• Added from time import time to the V1 token generation code snippet in docs/guides/ticktick_api/generate_v1_token.md
• Added client = Client() to the code snippets in docs/guides/cookbook/project_groups/get_a_project_group_by_id.md and get_a_project_group_by_name.md, which imported Client but never instantiated it

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes broken documentation code snippets in the TickTick API and cookbook guides by adding missing imports/initialization so the examples run as written.

Changes:

• Add from time import time to the V1 token generation snippet so time() usage is valid.
• Instantiate client = Client() in project group cookbook snippets that previously referenced client without defining it.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/guides/ticktick_api/generate_v1_token.md	Adds the missing time import required by the token expiration calculation in the example.
docs/guides/cookbook/project_groups/get_a_project_group_by_name.md	Defines client before calling client.get_batch_v2() in the snippet.
docs/guides/cookbook/project_groups/get_a_project_group_by_id.md	Defines client before calling client.get_batch_v2() in the snippet.

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