[Optimization] Enable BF16 gate computation for GLM and Qwen

[Sunny-bot1]

Motivation

GLM 和 Qwen的 gate weight都是BF16类型，没必要使用FP32计算，改成BF16计算以提升性能。

Modifications

1. 增加部署参数 gate-fp32 （默认False）

2. qwen3moe和glm4_moe gate权重类型选择：

   1. 命令行参数指定 --load-dynamic-weight（RL场景） or --gate-fp32 时，使用FP32
   2. 默认使用 BF16（与权重类型相同）

Usage or Command

Qwen3Moe or GLM 指定gate权重类型为FP32（默认使用BF16）

python -m fastdeploy.entrypoints.openai.api_server --model ${model_path} \
    --max-model-len 32768 \
    --max-num-seqs 128 \
    --port 8908 \
    --tensor-parallel-size 4 \
    --gate-fp32 \

Accuracy Tests

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 26.31579% with 42 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@e40fb16). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
..._executor/layers/moe/fused_moe_deepgemm_backend.py	0.00%	12 Missing ⚠️
...el_executor/layers/moe/fused_moe_triton_backend.py	25.00%	12 Missing ⚠️
...l_executor/layers/moe/fused_moe_cutlass_backend.py	33.33%	8 Missing ⚠️
...del_executor/layers/moe/fused_moe_wint2_backend.py	25.00%	4 Missing and 2 partials ⚠️
...el_executor/layers/moe/fused_moe_marlin_backend.py	0.00%	4 Missing ⚠️

Additional details and impacted files

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  Files              ?      391           
  Lines              ?    52809           
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  Hits               ?    36645           
  Misses             ?    13501           
  Partials           ?     2663           

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