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/frontend/package.json

@@ -1,23 +0,0 @@
-{
-  "name": "f1-stream-frontend",
-  "version": "1.0.0",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "dev": "vite dev",
-    "build": "vite build",
-    "preview": "vite preview"
-  },
-  "devDependencies": {
-    "@sveltejs/adapter-static": "^3.0.0",
-    "@sveltejs/kit": "^2.0.0",
-    "@sveltejs/vite-plugin-svelte": "^5.0.0",
-    "@tailwindcss/vite": "^4.0.0",
-    "svelte": "^5.0.0",
-    "tailwindcss": "^4.0.0",
-    "vite": "^6.0.0"
-  },
-  "dependencies": {
-    "hls.js": "^1.5.0"
-  }
-}