[Others] add PR Template (#4452)

* add PR Template

* update

* update

* update

* update

* update

* update

.github/pull_request_template.md

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+<!-- TemplateReference: https://github.com/PaddlePaddle/FastDeploy/blob/develop/.github/pull_request_template.md -->
+
+<!-- Thank you for your contribution! Please follow these guidelines to enhance your pull request. If anything is unclear, submit your PR and reach out to maintainers for assistance. -->
+
+## Motivation
+
+<!-- Describe the purpose and goals of this pull request. -->
+
+## Modifications
+
+<!-- Detail the changes made in this pull request. -->
+
+## Usage or Command
+
+<!-- You should provide the usage if this pr is about the new function. -->
+<!-- You should provide the command to run if this pr is about the performance optimization or fixing bug. -->
+
+## Accuracy Tests
+
+<!-- If this pull request affects model outputs (e.g., changes to the kernel or model forward code), provide accuracy test results. -->
+
+## 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.