chore: add GitHub workflows and issue templates

Add CI/CD workflows for nightly releases and pull request builds, along with
structured issue templates for bug reports and suggestions.

- Nightly workflow builds and releases both client and server binaries for
  Windows, creating signed tags and GitHub releases with detailed instructions.
- Pull request workflow triggers builds on PR events to validate changes.
- Issue templates guide users in reporting bugs and suggesting enhancements,
  linking to community Discord for support.

.github/workflows/pull-request.yml

@@ -0,0 +1,32 @@
+name: Pull Request Build
+
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    paths-ignore:
+      - '.gitignore'
+      - '*.md'
+      - '.github/*.md'
+
+jobs:
+  build:
+    runs-on: windows-latest
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup MSVC
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Setup CMake
+        uses: lukka/get-cmake@latest
+
+      - name: Run CMake
+        uses: lukka/run-cmake@v10
+        env:
+          VCPKG_ROOT: "" # Disable vcpkg for CI builds
+        with:
+          configurePreset: windows64
+          buildPreset: windows64-debug