chore : add Gitea CI workflows and .claude settings

- auto-tag-develop: auto version bump + tag on push to develop
- build-docker: build & push Docker image to Gitea registry on tag
- PR template
- .claude/settings.json with project permissions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-docker.yml

@@ -0,0 +1,30 @@
+name: Build & Push Docker Image
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login gitea.malio.fr -u "${{ gitea.repository_owner }}" --password-stdin
+
+      - name: Build Docker image
+        run: |
+          docker build \
+            -f infra/prod/Dockerfile \
+            -t gitea.malio.fr/malio-dev/coltura:${{ gitea.ref_name }} \
+            -t gitea.malio.fr/malio-dev/coltura:latest \
+            .
+
+      - name: Push Docker image
+        run: |
+          docker push gitea.malio.fr/malio-dev/coltura:${{ gitea.ref_name }}
+          docker push gitea.malio.fr/malio-dev/coltura:latest