Update default claude version to claude-sonnet-4-5-20250929

[chilin0525]

Update CLAUDE_DEFAULT_MODEL version to latest model version claude-sonnet-4-5-20250929 in .env.example and README.md.

Summary by CodeRabbit

• Chores
  • Updated the default Claude model version shown in configuration, usage examples, and documentation to the newer release.

[coderabbitai]

📝 Walkthrough

Walkthrough

Default Claude model string updated from claude-sonnet-4-20250514 to claude-sonnet-4-5-20250929 in environment example and README; no functional code or public API changes.

Changes

Cohort / File(s)	Summary
Configuration & Documentation .env.example, README.md	Replaced occurrences of claude-sonnet-4-20250514 with claude-sonnet-4-5-20250929 in environment example and documentation text. No behavioral changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A small hop in the config glade,
Sonnet's name receives an upgrade,
Docs refreshed, the defaults align,
A tiny change — the meadow's fine!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: updating the default Claude model version from the old version to claude-sonnet-4-5-20250929, which matches the file changes in .env.example and README.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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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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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In @.env.example:
- Line 14: Update the inline comment for the environment variable
CLAUDE_DEFAULT_MODEL to match the configured value by replacing the old default
text "默认: claude-sonnet-4-20250514" with the new default "默认:
claude-sonnet-4-5-20250929" so the comment aligns with the actual
CLAUDE_DEFAULT_MODEL value.