[fix]: PyO3 macOS linking and consolidate on tracing for logging

[slin1237]

Motivation

1. When building the project on macOS, we encountered linking errors with PyO3 - the linker couldn't find Python symbols like _PyBaseObject_Type and others
2. We had redundant logging dependencies (log and tracing)

Modifications

1. Added .cargo/config.toml with platform-specific configurations (default to Linux support, added Mac Arm and X86 chip, no windows support)
2. Removed unnecessary dependencies in Cargo.toml, including env_logger, log, and chrono
3. Migrated from log to tracing in router.rs

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling and Accuracy Results.
• For reviewers: If you haven't made any contributions to this PR and are only assisting with merging the main branch, please remove yourself as a co-author when merging the PR.
• Please feel free to join our Slack channel at https://slack.sglang.ai to discuss your PR.

[slin1237]

compiled in both linux and mac
Linux:

Mac