DAP-75: Docker-Unterstützung für xStream WebUI hinzugefügt

- webui/Dockerfile: Python 3.12-slim Image, Build-Kontext ist das Repo-Root
  damit plugin.video.xstream erreichbar bleibt
- docker-compose.yml: Service xstream-webui auf Port 5000, Cache-Volume
- .dockerignore: __pycache__, .git, .paperclip, etc. ausgeschlossen

Starten: docker compose up --build

.dockerignore

@@ -0,0 +1,9 @@
+**/__pycache__
+**/*.pyc
+**/*.pyo
+.git
+.gitignore
+.paperclip
+README.md
+DOKUMENTATION.md
+webui/cache/*

docker-compose.yml

@@ -0,0 +1,10 @@
+services:
+  xstream-webui:
+    build:
+      context: .
+      dockerfile: webui/Dockerfile
+    ports:
+      - "5000:5000"
+    volumes:
+      - ./webui/cache:/app/webui/cache
+    restart: unless-stopped

webui/Dockerfile

@@ -0,0 +1,21 @@
+# Build context must be the repo root (docker compose sets this automatically)
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install dependencies first for layer caching
+COPY webui/requirements.txt /app/webui/requirements.txt
+RUN pip install --no-cache-dir -r /app/webui/requirements.txt
+
+# Copy plugin sources required at runtime
+COPY plugin.video.xstream /app/plugin.video.xstream
+COPY script.module.xstreamscraper /app/script.module.xstreamscraper
+
+# Copy the web UI itself
+COPY webui /app/webui
+
+WORKDIR /app/webui
+
+EXPOSE 5000
+
+CMD ["python", "app.py"]