Add CI and SonarQube workflows for automated testing and code quality analysis

Co-authored-by: Copilot <copilot@github.com>

.gitea/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.23'
+          cache: true
+
+      - name: Run tests
+        run: go test -v -race -coverprofile=coverage.out ./src
+
+      - name: Upload coverage
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage
+          path: coverage.out
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.23'
+          cache: true
+
+      - name: Install golangci-lint
+        run: go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+
+      - name: Run linter
+        run: golangci-lint run ./src
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    needs: [test, lint]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.23'
+          cache: true
+
+      - name: Build binary (Linux)
+        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o epage-linux ./src
+
+      - name: Build binary (macOS)
+        run: CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -o epage-macos ./src
+
+      - name: Build binary (Windows)
+        run: CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o epage-windows.exe ./src
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            epage-linux
+            epage-macos
+            epage-windows.exe

.gitea/workflows/sonarqube.yml

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+name: SonarQube Scan
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  sonarqube:
+    name: SonarQube Analysis
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.23'
+          cache: true
+
+      - name: Run tests with coverage
+        run: go test -v -coverprofile=coverage.out ./src
+
+      - name: Run SonarQube scanner
+        uses: SonarSource/sonarqube-scan-action@v7.1.0
+        env:
+          SONAR_HOST_URL: ${{ secrets.SONAR_URL }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}