feat(deploy): build + serve worker and admin as static nginx images

- per-app Dockerfiles (vite build → nginx) + SPA nginx.conf
- Gitea workflow pushes 3 images; frontends bake VITE_API_URL
- docker-compose.prod.yml (registry images, solelog_network) + .env.prod.example
- docker-compose.yml runs the full stack locally; add .dockerignore

apps/worker/Dockerfile

@@ -0,0 +1,28 @@
+# ---- build stage: produce the static Vite bundle ----
+FROM node:22-alpine AS build
+RUN corepack enable
+WORKDIR /repo
+
+# Workspace manifests first, so `yarn install` layers cache across source changes
+COPY package.json yarn.lock .yarnrc.yml ./
+COPY packages/shared/package.json ./packages/shared/package.json
+COPY apps/worker/package.json ./apps/worker/package.json
+RUN yarn workspaces focus @solelog/worker
+
+# Sources (@solelog/shared is consumed as raw TS, so it just needs to be present)
+COPY packages/shared/ ./packages/shared/
+COPY apps/worker/ ./apps/worker/
+
+# The API base URL is baked into the bundle at build time (Vite inlines import.meta.env.*).
+# Defaults to localhost for local builds; the Gitea workflow overrides it for production.
+ARG VITE_API_URL=http://localhost:3000
+ENV VITE_API_URL=$VITE_API_URL
+# `vite build` only (no `tsc -b`): the image ships the bundle; type/test checks
+# are a separate CI concern and shouldn't gate the production image.
+RUN yarn workspace @solelog/worker exec vite build
+
+# ---- runtime stage: serve the static files with nginx ----
+FROM nginx:alpine AS runtime
+COPY apps/worker/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /repo/apps/worker/dist /usr/share/nginx/html
+EXPOSE 80

apps/worker/nginx.conf

@@ -0,0 +1,23 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_types text/css application/javascript application/json image/svg+xml;
+
+    # Hashed build assets are immutable — cache them hard.
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+
+    # SPA fallback: any unknown path serves index.html so React Router can
+    # handle it client-side (deep links and refreshes work). Never cache the shell.
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cache-Control "no-cache";
+    }
+}