Add issue and PR templates, direct to server repo (fixes #3)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Server repository (bugs, features, game logic)
+    url: https://github.com/decompfrontier/server/issues
+    about: For server emulator issues, game logic, or general Brave Frontier offline mod discussion, please open an issue in the server repository.

.github/ISSUE_TEMPLATE/issue.md

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+---
+name: Issue (offline-proxy)
+about: Report a bug or request related to this proxy (DLL / build / packaging only)
+title: ''
+labels: ''
+assignees: ''
+---
+
+**Before opening an issue here**
+
+- **Server / game logic / offline mod behaviour:** please use the **[server repository](https://github.com/decompfrontier/server/issues)** instead. Many issues (e.g. connection, game behaviour, server bugs) belong there.
+- **This repo (offline-proxy)** is for the Windows proxy DLL, build, and packaging only.
+
+---
+
+**Description**
+
+(Describe your issue.)
+
+**Environment**
+
+- Windows version:
+- Build preset used (e.g. deploy-vs, debug-mingw):
+
+**Steps to reproduce** (if applicable)
+
+1.
+2.
+
+**Expected vs actual**
+
+(What you expected vs what happened.)

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+(Brief description of the change.)
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] Documentation
+- [ ] Build / CI
+- [ ] Other (please describe)
+
+## Checklist
+
+- [ ] Change is limited to this repository (offline-proxy). For server or game-logic changes, please open a PR in the [server repository](https://github.com/decompfrontier/server) instead.
+- [ ] Build passes with the preset(s) you used (e.g. `deploy-vs`, `debug-mingw`).
+
+---
+
+**Related issue:** (e.g. Fixes #3)