feat(userbot): add Kubernetes control panel

Manage Telegram instances through Kubernetes with legacy adoption for forust and anna. Build and deploy the panel image alongside the runtime.

userbot/panel/Dockerfile

@@ -0,0 +1,32 @@
+FROM node:22-alpine AS frontend
+
+WORKDIR /src
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+FROM python:3.13-slim AS python-builder
+
+WORKDIR /build
+COPY backend/requirements.txt ./
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends build-essential \
+    && pip install --no-cache-dir --prefix=/install -r requirements.txt \
+    && rm -rf /var/lib/apt/lists/*
+
+FROM python:3.13-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PANEL_STATIC_DIR=/app/static
+
+WORKDIR /app
+COPY --from=python-builder /install /usr/local
+COPY backend/app ./app
+COPY --from=frontend /src/dist ./static
+
+USER 65532:65532
+EXPOSE 8080
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080"]