chore: add issue/pr template

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: 🐞 Bug report
+description: Report a bug to help us reproduce and fix it.
+title: "[Bug] "
+labels: ['Bug']
+
+body:
+- type: checkboxes
+  attributes:
+    label: Checklist
+    options:
+      - label: I searched related issues but found no solution.
+      - label: The bug persists in the latest version.
+      - label: Issues without environment info and a minimal reproducible demo are hard to resolve and may receive no feedback.
+      - label: If this is not a bug report but a general question, please start a discussion in Issues. Otherwise, it will be closed.
+      - label: Please use English. Otherwise, it will be closed.
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: A clear, concise description of the bug.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Reproduction
+    description: Command/script run and configuration used.
+    placeholder: Paste the command here.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+      Provide your environment info, including:
+      - OS version
+      - Python version
+      - sglang-diffusion-routing version (`pip show sglang-diffusion-routing`)
+      - Related dependency versions (fastapi, httpx, uvicorn)
+    placeholder: Paste environment output here.
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/2-feature-request.yml

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+name: 🚀 Feature request
+description: Suggest an idea for this project
+title: "[Feature] "
+
+body:
+- type: checkboxes
+  attributes:
+    label: Checklist
+    options:
+      - label: If this is not a feature request but a general question, please start a discussion in Issues. Otherwise, it will be closed.
+      - label: Please use English. Otherwise, it will be closed.
+- type: textarea
+  attributes:
+    label: Motivation
+    description: |
+      Clearly and concisely describe the feature's motivation.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Related resources
+    description: |
+      Provide official releases or third-party implementations if available.

.github/pull_request_template.md

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+<!-- 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. -->
+
+## Accuracy Tests
+
+<!-- If this pull request affects routing behavior or model outputs, provide accuracy test results. -->
+
+## Benchmarking and Profiling
+
+<!-- If this pull request impacts routing performance or throughput, provide benchmarking and profiling results. -->
+
+## Checklist
+
+- [ ] Format your code with `pre-commit run --all-files`.
+- [ ] Add or update unit tests if applicable.
+- [ ] Update documentation if applicable.
+- [ ] Provide accuracy and performance benchmark results if applicable.
+- [ ] Ensure all CI checks pass.
+
+## Review Process
+
+1. Get approvals from maintainers and other reviewers.
+2. Ensure all CI tests pass.
+3. After green CI and required approvals, ask maintainers to merge.