Add SonarQube Gitea Actions workflow and Gitflow quality gate setup.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitea/workflows/sonar.yml

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+name: sonar
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+      - "release/**"
+  pull_request:
+    branches:
+      - main
+      - develop
+      - "release/**"
+
+jobs:
+  sonar:
+    name: sonar
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: SonarQube Scan + Quality Gate
+        uses: sonarsource/sonarqube-scan-action@v5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+        with:
+          args: >
+            -Dsonar.qualitygate.wait=true
+            -Dsonar.qualitygate.timeout=300

sonar-project.properties

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+sonar.projectKey=TicketLab_MCP
+sonar.projectName=TicketLab_MCP
+sonar.sources=.
+sonar.exclusions=**/.gitea/**,**/.git/**,**/.cursor/**
+sonar.sourceEncoding=UTF-8
+sonar.python.version=3