feat: Add Docker config, Gitea workflow, and map improvements

- Add Dockerfile, nginx.conf, docker-compose.yml
- Add Gitea Actions workflow
- Improve map mobile UX (safe area, no pull-to-refresh)
- Persist map state (zoom, center, layer) to localStorage
- Add Google Hybrid map layer
- Configure Vite for Cloudflare tunnel

.gitea/workflows/docker-build.yml

@@ -0,0 +1,18 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag my-image-name:$(date +%s)