feat: F5.6b server F as an image: the editor from F itself, one stack per environment

F hands out the editor's page and bundle (editor/ beside main.mjs, or
FILIUS_EDITOR_DIR): GET and HEAD only, one wall against leaving the folder,
F's own routes first, assets/ cached a year, the rest asked for again; the
build lays .br and .gz beside the files and F sends the better one the
browser takes (bundle 695 KB to 212 KB).

deploy/Dockerfile: two stages, Node 24, no node_modules, not root.
deploy/docker-compose.yml with an env file per environment: the file sets
the stack's name, volume, image tag and port (test 8081, production 8080).
Measured with both stacks side by side behind nginx and Chromium.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/server/package.json

@@ -8,7 +8,7 @@
     ".": "./src/index.ts"
   },
   "scripts": {
-    "build": "esbuild src/main.ts src/simWorker.ts --bundle --platform=node --format=esm --target=node20 --outdir=dist --out-extension:.js=.mjs --external:pg-native --banner:js=\"import { createRequire } from 'node:module'; const require = createRequire(import.meta.url);\"",
+    "build": "esbuild src/main.ts src/simWorker.ts src/precompressMain.ts --bundle --platform=node --format=esm --target=node20 --outdir=dist --out-extension:.js=.mjs --external:pg-native --banner:js=\"import { createRequire } from 'node:module'; const require = createRequire(import.meta.url);\"",
     "start": "node dist/main.mjs"
   },
   "dependencies": {