docs: use segmented README badges

[Disaster-Terminator]

Summary

• replace the previous large README badge cards with compact segmented Shields.io badges
• add a second badge row for the lightweight stack: Python 3.11+, FastAPI, YAML, pytest, uv
• remove internal/meta README wording and keep the deployment guidance product-facing
• keep Chinese and English README badge blocks and wording aligned

Notes

This is documentation-only. It does not change runtime code, config, tests, secrets, or repository metadata.

Summary by Sourcery

刷新 README 文档，以使用紧凑分段徽章，并在英文和中文版本的 README 中澄清 IntentMux 与 LiteLLM 的部署和运行时行为。

Documentation:

• 将 README 中的大型卡片式徽章替换为紧凑分段的 Shields.io 徽章，并新增一行，用于突出轻量级的 Python/FastAPI/YAML/pytest/uv 技术栈。
• 在英文和中文文档中澄清部署指南，将 IntentMux 定位为 LiteLLM 的 sidecar，并强调将 provider 密钥和 LiteLLM 数据保存在代码仓库之外。
• 优化对 semantic-router 入口及当前运行时行为/能力的说明，使英文和中文 README 之间的措辞保持一致。

Original summary in English

Summary by Sourcery

Refresh README documentation to use compact segmented badges and clarify deployment and runtime behavior for IntentMux alongside LiteLLM in both English and Chinese readmes.

Documentation:

• Replace large card-style README badges with compact segmented Shields.io badges and add a second row highlighting the lightweight Python/FastAPI/YAML/pytest/uv stack.
• Clarify deployment guidance to position IntentMux as a LiteLLM sidecar and keep provider secrets and LiteLLM data outside the repository, in both English and Chinese documentation.
• Refine explanations of the semantic-router entry and current runtime behavior/capabilities, aligning wording between the English and Chinese READMEs.

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[sourcery-ai]

嗨——我已经审查了你的修改，看起来非常棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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