Add Docker support with Dockerfile and docker-compose.yml, update build scripts and README for containerized deployment.

- Updated server `Bun.build` configuration: adjusted `outdir`, added `format` as `esm`, and set `@open-gsio/client` to external.
- Expanded README with Docker instructions.
- Added new package `@open-gsio/analytics-worker`.
- Upgraded dependencies (`vite`, `typescript`, `bun`) and locked `pnpm` version in `package.json`.

packages/server/vite.config.ts

@@ -4,9 +4,12 @@ import { configDefaults } from 'vitest/config';
 
 export default defineConfig(({ command }) => {
   return {
+    build: {
+      cssMinify: 'esbuild',
+    },
     test: {
       globals: true,
-      environment: 'jsdom',
+      environment: 'node',
       registerNodeLoader: false,
       // setupFiles: ['./src/test/setup.ts'],
       exclude: [...configDefaults.exclude, 'dist/**', '.open-gsio/**'],