style: add autopep8 pre-commit hook and apply PEP 8 formatting fixes

[windreamer]

Summary

Add autopep8 as a pre-commit formatting hook and apply its auto-fixes across the codebase to enforce consistent PEP 8 style.

Changes

• Add autopep8 v2.3.2 hook to .pre-commit-config.yaml (runs before the existing Ruff linter)
• Configure autopep8 in pyproject.toml with max_line_length = 120 and aggressive = 3 to match the project's existing line-length convention

[Copilot]

Pull request overview

This PR updates the repository’s Python formatting workflow by adding autopep8 to pre-commit and applying automated style-only formatting fixes across Python source and test files.

Changes:

• Add autopep8 as a pre-commit hook and configure autopep8 in pyproject.toml (line length 120, aggressive mode).
• Apply autopep8-driven whitespace/indentation fixes across various modules, kernels, CLI utilities, and tests.
• Minor formatting cleanup (string concatenation layout, hanging indents, spacing around operators).

Reviewed changes

Copilot reviewed 9 out of 41 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_lmdeploy/test_vl/test_nonhf_chat_template.py	Auto-format string literal continuation in test fixture.
tests/pytorch/spec_decode/test_reject_sample.py	Auto-format tensor construction indentation.
tests/pytorch/kernel/test_fill_kv_cache.py	Auto-format pytest parametrize indentation.
tests/pytorch/engine/test_logits_process.py	Auto-format tensor literal indentation.
pyproject.toml	Add [tool.autopep8] configuration (line length/aggressive).
lmdeploy/vl/model/xcomposer2.py	Spacing tweak inside f-string expression.
lmdeploy/vl/model/llava.py	Indentation cleanup in torch.cat call.
lmdeploy/vl/model/interns1_pro.py	Remove stray whitespace-only line.
lmdeploy/vl/__init__.py	Reformat multi-import block.
lmdeploy/turbomind/turbomind.py	Reformat multi-line assert message indentation.
lmdeploy/serve/proxy/proxy.py	Reformat json.dump argument indentation.
lmdeploy/serve/core/async_engine.py	Indentation cleanup and remove stray blank line.
lmdeploy/pytorch/strategies/ar_spec/model_agent.py	Spacing in tensor indexing/slicing expression.
lmdeploy/pytorch/models/qwen3_5.py	Reformat long call indentation; remove extra blank line.
lmdeploy/pytorch/models/glm4moe_mtp.py	Spacing inside f-string expression.
lmdeploy/pytorch/models/glm4_moe.py	Spacing inside f-string expression.
lmdeploy/pytorch/models/deepseek_v2.py	Spacing inside f-string expression.
lmdeploy/pytorch/models/deepseek_mtp.py	Spacing inside f-string expression.
lmdeploy/pytorch/kernels/cuda/w8a8_triton_kernels.py	Indentation adjustment in benchmark config literal.
lmdeploy/pytorch/kernels/cuda/w8a8_fused_moe.py	Indentation cleanup in Triton config list.
lmdeploy/pytorch/kernels/cuda/rms_norm.py	Replace explicit \ string concatenation with implicit literal concat formatting.
lmdeploy/pytorch/kernels/cuda/fused_moe.py	Indentation cleanup in Triton config list.
lmdeploy/pytorch/kernels/cuda/causal_conv1d.py	Indentation cleanup for a wrapped argument.
lmdeploy/pytorch/kernels/cuda/blocked_gemm_fp8.py	Indentation cleanup for decorator arguments.
lmdeploy/pytorch/kernels/__init__.py	Reformat multi-import block.
lmdeploy/pytorch/engine/model_agent/agent.py	Remove double-space in assignment.
lmdeploy/pytorch/backends/dlinfer/maca/op_backend.py	Indentation cleanup for continued expression.
lmdeploy/profiler.py	Spacing around arithmetic operators inside f-strings.
lmdeploy/pipeline.py	Expand one-line if to block for readability.
lmdeploy/model.py	Indentation cleanup for line-continued f-strings.
lmdeploy/metrics/loggers.py	Remove extra spaces in f-string expressions.
lmdeploy/messages.py	Indentation cleanup in asserts / continuation lines.
lmdeploy/lite/utils/__init__.py	Reformat multi-import block.
lmdeploy/cli/utils.py	Reformat asserts/help strings; remove help=\ style.
lmdeploy/api.py	Docstring formatting tweak for noqa spacing.
autotest/tools/pipeline/mllm_case.py	Spacing inside f-string expression.
autotest/interface/restful/test_restful_generate.py	Spacing inside f-string expression.
autotest/interface/restful/test_restful_chat_completions_v1.py	Re-indent long string literal continuation.
.pre-commit-config.yaml	Add autopep8 pre-commit hook.
.github/scripts/eval_chat_config.py	Indentation cleanup in function call.
.github/scripts/action_tools.py	Spacing inside f-string expression.

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