f1-stream: consume Forgejo-registry image; drop in-monorepo source

The actively-developed f1-stream (infra files/ copy: 12 active extractors +
Playwright/chrome-service verifier) is now its own repo viktor/f1-stream and is
the deployed app (replacing the stale March github build).

- main.tf: image -> forgejo.viktorbarzin.me/viktor/f1-stream:${var.image_tag}
  + image_pull_secrets registry-credentials. Image stays in KEEL_IGNORE_IMAGE.
- Remove stacks/f1-stream/files/ (source now in viktor/f1-stream).
- docs/plans: extraction design + plan pair.

Applied via tg + kubectl set image to forgejo:24857a82; live /health green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/f1-stream/files/Dockerfile

@@ -1,44 +0,0 @@
-## Stage 1: Build frontend
-FROM node:22-slim AS frontend-builder
-
-WORKDIR /frontend
-
-COPY frontend/package.json frontend/package-lock.json* ./
-RUN npm install
-
-COPY frontend/ ./
-RUN npm run build
-
-## Stage 2: Python backend + static frontend
-FROM python:3.13-slim-bookworm
-
-WORKDIR /app
-
-# Headless Chromium runtime libs for the playback verifier. Listed inline
-# (instead of running `playwright install-deps`) so the image build doesn't
-# need root-network apt fetches at runtime.
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    ca-certificates \
-    libnss3 libnspr4 \
-    libatk1.0-0 libatk-bridge2.0-0 libcups2 \
-    libdrm2 libxkbcommon0 libxcomposite1 libxdamage1 \
-    libxfixes3 libxrandr2 libgbm1 libpango-1.0-0 libcairo2 \
-    libasound2 libatspi2.0-0 \
-    fonts-liberation fonts-noto-color-emoji \
- && rm -rf /var/lib/apt/lists/*
-
-COPY backend/requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-
-# Install the Chromium browser binary used by the verifier. Skip
-# --with-deps because we already installed the system libs above.
-RUN playwright install chromium
-
-COPY backend/ ./backend/
-
-# Copy built frontend into the image
-COPY --from=frontend-builder /frontend/build ./frontend/build
-
-EXPOSE 8000
-
-CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8000"]