fix: 修复 auth token 响应处理

[foxzool]

Summary

• align auth v3 token and app_ticket endpoints with official flattened response bodies
• preserve authen v1 user_info compatibility while sending the user access token through explicit Authorization headers
• avoid logging raw flattened token response bodies and ignore .omo/ work files
• update auth examples, README snippets, and token provider coverage

Validation

• cargo test -p openlark-auth --lib
• cargo test -p openlark-core --lib
• cargo check -p openlark-auth --examples
• cargo fmt --all -- --check
• cargo clippy -p openlark-auth -p openlark-core --all-targets -- -D warnings
• git diff --check

Fixes #196

[chatgpt-codex-connector]

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