infra: docker compose dev + production Dockerfiles

- docker-compose.dev.yml: hot-reload dev stack (rete-watch + server :7357 + web :5173)
- docker-compose.yml: production stack
- packages/chess/Dockerfile + nginx.conf: chess web image
- packages/server/Dockerfile: server image
- Dockerfile.dev: shared dev base image (Bun + workspace deps preinstalled)
- .dockerignore: build context exclusions

Used by Playwright e2e tests (run via .sisyphus/scripts/run-pw.sh which connects to the running dev stack instead of spawning its own server).

.dockerignore

@@ -0,0 +1,23 @@
+**/node_modules
+**/dist
+**/coverage
+**/.vite
+**/*.tsbuildinfo
+**/test-results
+**/playwright-report
+**/playwright-transform-cache-*
+.git
+.github
+.sisyphus
+node-compile-cache
+docs
+*.log
+.DS_Store
+org.chromium.Chromium.*
+.org.chromium.Chromium.*
+7xOfJqsDU787fe61oSCq1
+IJGn1F-WxLUCbfU1lu8pU
+KMr2_dqTOvh2R-Vg1E6cO
+.playwright-mcp
+Dockerfile*
+docker-compose*.yml