feat: add OpenWebUI AI chat service (ai.xiteng.site)

- New service: OpenWebUI v0.9.5 with Authentik OIDC auth
- compose.yml with Traefik, Homepage, AutoKuma labels
- Network fix: HF_ENDPOINT mirror + custom DNS for China
- Authentik grant_types fix documented in README
- .gitignore: openwebui/data/ and openwebui/.env

openwebui/compose.yml

@@ -0,0 +1,58 @@
+services:
+  openwebui:
+    image: ghcr.io/open-webui/open-webui:v0.9.5
+    container_name: openwebui
+    restart: unless-stopped
+    volumes:
+      - ./data:/app/backend/data
+    environment:
+      # --- OIDC 认证 (Authentik) ---
+      - WEBUI_AUTH=true
+      - ENABLE_OAUTH_SIGNUP=true
+      - OAUTH_CLIENT_ID=openwebui-63f6865e
+      - OAUTH_CLIENT_SECRET=65cecaf8cc974c7fad55c749c65e50ee06bae0a9c8614252b4a44707a700c188
+      - OPENID_PROVIDER_URL=https://auth.xiteng.site/application/o/openwebui/.well-known/openid-configuration
+      - OAUTH_SCOPES=openid email profile
+      - OAUTH_PROVIDER_NAME=Authentik
+      - WEBUI_URL=https://ai.xiteng.site
+      # --- Session ---
+      - WEBUI_SECRET_KEY=${OPENWEBUI_SECRET_KEY}
+      # --- 网络 (解决国内 IPv6/ghcr 访问问题) ---
+      - HF_ENDPOINT=https://hf-mirror.com
+    dns:
+      - 223.5.5.5
+      - 114.114.114.114
+    labels:
+      # ========== Traefik ==========
+      - "traefik.enable=true"
+      # HTTPS router (cert management)
+      - "traefik.http.routers.openwebui.rule=Host(`ai.xiteng.site`)"
+      - "traefik.http.routers.openwebui.entrypoints=websecure"
+      - "traefik.http.routers.openwebui.tls=true"
+      - "traefik.http.routers.openwebui.tls.certresolver=cfresolver"
+      - "traefik.http.services.openwebui.loadbalancer.server.port=8080"
+      # HTTP router (Cloudflare Tunnel ingress)
+      - "traefik.http.routers.openwebui-http.rule=Host(`ai.xiteng.site`)"
+      - "traefik.http.routers.openwebui-http.service=openwebui"
+      - "traefik.http.routers.openwebui-http.entrypoints=web"
+      # X-Forwarded-Proto middleware
+      - "traefik.http.middlewares.force-https.headers.customrequestheaders.X-Forwarded-Proto=https"
+      - "traefik.http.routers.openwebui.middlewares=force-https"
+      - "traefik.http.routers.openwebui-http.middlewares=force-https"
+      # ========== Homepage ==========
+      - "homepage.group=我的服务"
+      - "homepage.name=OpenWebUI"
+      - "homepage.icon=si-openwebui"
+      - "homepage.href=https://ai.xiteng.site"
+      - "homepage.description=AI Chat 界面"
+      # ========== AutoKuma ==========
+      - "kuma.openwebui.http.name=OpenWebUI"
+      - "kuma.openwebui.http.url=http://openwebui:8080"
+      - "kuma.openwebui.http.interval=60"
+      - "kuma.openwebui.http.max_retries=3"
+    networks:
+      - homelab_net
+
+networks:
+  homelab_net:
+    external: true