Add CI and deploy workflows for Gitea Actions

CI runs ruff and eslint/tsc on push to develop and PRs. Deploy
workflow is manual (workflow_dispatch) and builds, pushes, and
deploys images to Unraid via SSH.

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

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [develop]
+  pull_request:
+    branches: [develop]
+
+jobs:
+  backend-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install ruff
+      - name: Check linting
+        run: ruff check backend/
+      - name: Check formatting
+        run: ruff format --check backend/
+
+  frontend-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "24"
+      - name: Install dependencies
+        run: npm ci
+        working-directory: frontend
+      - name: Lint
+        run: npm run lint
+        working-directory: frontend
+      - name: Type check
+        run: npx tsc -b
+        working-directory: frontend