docs: add model benchmark and specification reference documentation

Add comprehensive reference documentation for model benchmarks and specifications to guide manifest creation and updates.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ericyangpan

docs/MODEL_BENCHMARK_REFERENCE.md

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+SWE-bench：https://www.swebench.com
+Terminal-Bench：https://www.tbench.ai/leaderboard/terminal-bench/2.0
+MMMU：https://mmmu-benchmark.github.io/#leaderboard
+MMMU-Pro：https://mmmu-benchmark.github.io/#leaderboard
+WebDev Arena：https://web.lmarena.ai/leaderboard
+SciCode：https://scicode-bench.github.io/leaderboard/
+LiveCodeBench：https://livecodebench.github.io/leaderboard.html

docs/MODEL_SPEC_REFERENCE.md

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+# Model Spec Reference
+
+## Foundation Model Providers
+
+| Provider | Model List | Model Detail |
+|----------|------------|-------------|
+| Alibaba Cloud | https://help.aliyun.com/zh/dashscope/developer-reference/tongyiqianwen-large-language-models | https://help.aliyun.com/zh/dashscope/developer-reference/tongyiqianwen-large-language-models#`{modelId}` |
+| Anthropic | https://platform.claude.com/docs/en/about-claude/models/overview |  |
+| DeepSeek | https://platform.deepseek.com/api-docs/zh-cn/ | https://platform.deepseek.com/api-docs/zh-cn/ |
+| Google AI | https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models | https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro |
+| Meta AI | https://llama.meta.com/docs/models/ | https://llama.meta.com/docs/models/`{modelId}` |
+| MiniMax | https://platform.minimaxi.com/document/LLM/introduction | https://platform.minimaxi.com/document/LLM/introduction |
+| Moonshot | https://platform.moonshot.ai/docs | - |
+| OpenAI | https://platform.openai.com/docs/models | https://platform.openai.com/docs/models/gpt-5.2 |
+| xAI | https://docs.x.ai/docs/models | https://docs.x.ai/docs |
+| Z.ai | https://docs.z.ai | - |
+
+## Model Service Providers
+
+| Provider | Model List | Model Detail |
+|----------|------------|-------------|
+| OpenRouter | https://openrouter.ai/models | https://openrouter.ai/models/`{modelId}` |
+| SiliconFlow | https://docs.siliconflow.cn/Models | - |