ci: добавить GitHub Actions (build + release)

.github/workflows/build.yml

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+name: Build & Test
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build LoChat
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build & Test
+        run: ./gradlew build --no-daemon
+
+      - name: JaCoCo Report
+        uses: actions/upload-artifact@v4
+        with:
+          name: jacoco-report
+          path: build/reports/jacoco/test/html/
+
+      - name: Test Results
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: build/test-results/
+
+      - name: Plugin JAR
+        uses: actions/upload-artifact@v4
+        with:
+          name: LoChat-Plugin
+          path: build/libs/LoChat-*.jar

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build
+        run: ./gradlew clean build --no-daemon
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          name: "LoChat ${{ github.ref_name }}"
+          body: |
+            ## 🚀 LoChat ${{ github.ref_name }}
+
+            - Сервер: Paper/Folia 1.21+
+            - Java: 21
+
+            ### 📦 Установка
+            Скопируйте `LoChat-*.jar` в папку `plugins/` сервера и перезагрузите.
+
+            ### 🔧 Зависимости (опционально)
+            - PlaceholderAPI
+            - PlayerPoints
+            - LuckPerms
+            - SkinsRestorer
+
+            Полный список изменений: [Commits](https://github.com/loki5512344/LoChat/commits/main)
+          files: build/libs/LoChat-*.jar
+          generateReleaseNotes: true