feat: add python-security-checks reusable workflow

Dedicated security-only workflow using python:VERSION-slim.
Runs Bandit (or any security tool) without pytest or coverage.
Supports python_version, install_command, security_command,
and working_directory inputs with sensible defaults.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/notifications.yml

@@ -147,7 +147,11 @@ jobs:
             exit 0
           fi
 
-          COMMIT_SUBJECT="$(git log -1 --pretty=%s 2>/dev/null || echo 'Commit info unavailable')"
+          COMMIT_SUBJECT="$(curl -fsS \
+            -H "Authorization: Bearer ${{ secrets.API_GITEA_TOKEN }}" \
+            "${{ gitea.server_url }}/api/v1/repos/${{ gitea.repository }}/git/commits/${{ gitea.sha }}" \
+            | python3 -c "import json,sys; d=json.load(sys.stdin); print(d.get('RepoCommit',{}).get('message','').split('\n')[0])" \
+            2>/dev/null || echo 'Commit info unavailable')"
           RUN_URL="${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_number }}"
 
           cat <<EOF >/tmp/ntfy-payload.json

.gitea/workflows/python-checks.yml

@@ -17,7 +17,7 @@ on:
         default: "coverage run -m pytest"
       coverage_fail_under:
         type: string
-        default: "60"
+        default: "80"
       run_security_scan:
         type: boolean
         default: true

.gitea/workflows/python-security-checks.yml

@@ -0,0 +1,35 @@
+name: Reusable Python Security Checks
+
+on:
+  workflow_call:
+    inputs:
+      python_version:
+        type: string
+        default: "3.14"
+      install_command:
+        type: string
+        default: 'python -m pip install "bandit[toml]"'
+      security_command:
+        type: string
+        default: "python -m bandit -r app -c pyproject.toml"
+      working_directory:
+        type: string
+        default: "."
+
+jobs:
+  security:
+    runs-on: docker
+    container:
+      image: python:${{ inputs.python_version }}-slim
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install security tools
+        working-directory: ${{ inputs.working_directory }}
+        run: ${{ inputs.install_command }}
+
+      - name: Run security scan
+        working-directory: ${{ inputs.working_directory }}
+        run: ${{ inputs.security_command }}