Add bilingual issue and PR templates

English first, Chinese at the end in a collapsed <details> block. The PR
template lists the tests/neuron suite commands.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/task.md

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+---
+name: Task
+about: A self-contained task for the Neuron (Trainium) port
+title: "[area] "
+labels: ''
+assignees: ''
+---
+
+**Context.** What is observed today (symptom, measurement, file/function involved).
+
+**Task.** What to change, and where.
+
+**Done when.** The concrete check that closes the issue (test command, numbers).
+
+**Pointers.** Relevant files, issues (#N), docs, prior art.
+
+---
+Branch: `neuron`. Design notes: [`deepinfer/neuron_ops/NEURON_PORT.md`](https://github.com/whn09/DeepInfer/blob/neuron/deepinfer/neuron_ops/NEURON_PORT.md). Test suite: `tests/neuron/setup_trn2.sh`, `tests/neuron/run_all.sh` (CPU mode: `DEEPINFER_NEURON_DEVICE=cpu`). Comment here to claim this task.
+
+<details>
+<summary>中文</summary>
+
+**背景。** 目前观察到的情况（现象、测量结果、涉及的文件/函数）。
+
+**任务。** 要改什么、改在哪里。
+
+**完成标准。** 关闭该 issue 的具体检查方式（测试命令、数值）。
+
+**线索。** 相关文件、issue（#N）、文档、已有参考实现。
+
+---
+分支：`neuron`。设计说明：[`deepinfer/neuron_ops/NEURON_PORT.md`](https://github.com/whn09/DeepInfer/blob/neuron/deepinfer/neuron_ops/NEURON_PORT.md)。测试套件：`tests/neuron/setup_trn2.sh`、`tests/neuron/run_all.sh`（CPU 模式：`DEEPINFER_NEURON_DEVICE=cpu`）。在此留言即可认领该任务。
+
+</details>

.github/pull_request_template.md

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+## Summary
+What this PR does and why.
+
+## Changes
+- 
+
+## Testing
+- [ ] `bash tests/neuron/run_all.sh cpu` (host only)
+- [ ] `CORES=<range> bash tests/neuron/run_all.sh device` (if you have free NeuronCores; state the range used)
+
+Paste the relevant results (pass/fail, numbers vs golden).
+
+## Related issues
+Closes #
+
+<details>
+<summary>中文</summary>
+
+## 概述
+本 PR 做了什么、为什么。
+
+## 改动
+- 
+
+## 测试
+- `bash tests/neuron/run_all.sh cpu`（仅 host）
+- `CORES=<range> bash tests/neuron/run_all.sh device`（如有空闲 NeuronCore；注明所用范围）
+
+贴出相关结果（通过/失败、与 golden 对比的数值）。
+
+## 相关 issue
+Closes #
+
+</details>