chore: migrate from ESLint/Prettier to Biome

- Add biome.json with recommended preset + custom rules
- Remove eslint.config.mjs (root, apps/react, apps/elysia)
- Remove .prettierrc and .prettierignore
- Update package.json: remove eslint/prettier deps, add biome scripts
- Update Makefile: lint/format targets to biome
- Update CI (lint.yml): eslint -> biome ci
- Update VSCode config: biomejs.biome extension + default formatter
- Apply biome format --write to all files
- Update submodule pointers for react and elysia

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

infra/docker/react-server.js

@@ -1,75 +1,77 @@
-import { existsSync, readFileSync } from "node:fs"
-import { resolve, sep } from "node:path"
+import { existsSync, readFileSync } from 'node:fs';
+import { resolve, sep } from 'node:path';
 
-const distDir = resolve("./dist")
-const indexPath = resolve(distDir, "index.html")
+const distDir = resolve('./dist');
+const indexPath = resolve(distDir, 'index.html');
 
 const contentTypes = {
-  html: "text/html; charset=utf-8",
-  css: "text/css; charset=utf-8",
-  js: "application/javascript; charset=utf-8",
-  json: "application/json; charset=utf-8",
-  svg: "image/svg+xml",
-  png: "image/png",
-  jpg: "image/jpeg",
-  jpeg: "image/jpeg",
-  gif: "image/gif",
-  webp: "image/webp",
-  ico: "image/x-icon",
-  woff: "font/woff",
-  woff2: "font/woff2",
-  ttf: "font/ttf",
-}
+  html: 'text/html; charset=utf-8',
+  css: 'text/css; charset=utf-8',
+  js: 'application/javascript; charset=utf-8',
+  json: 'application/json; charset=utf-8',
+  svg: 'image/svg+xml',
+  png: 'image/png',
+  jpg: 'image/jpeg',
+  jpeg: 'image/jpeg',
+  gif: 'image/gif',
+  webp: 'image/webp',
+  ico: 'image/x-icon',
+  woff: 'font/woff',
+  woff2: 'font/woff2',
+  ttf: 'font/ttf',
+};
 
 function responseFromFile(filePath, headers) {
   try {
-    return new Response(readFileSync(filePath), { headers })
+    return new Response(readFileSync(filePath), { headers });
   } catch (error) {
-    if (error?.code === "ENOENT") {
-      return new Response("Not Found", { status: 404 })
+    if (error?.code === 'ENOENT') {
+      return new Response('Not Found', { status: 404 });
     }
 
-    console.error("File read error:", error)
-    return new Response("Internal Server Error", { status: 500 })
+    console.error('File read error:', error);
+    return new Response('Internal Server Error', { status: 500 });
   }
 }
 
 function serveIndex() {
   return responseFromFile(indexPath, {
-    "Content-Type": contentTypes.html,
-    "Cache-Control": "no-cache",
-  })
+    'Content-Type': contentTypes.html,
+    'Cache-Control': 'no-cache',
+  });
 }
 
 function serveFile(filePath, pathname) {
-  const ext = filePath.split(".").pop() || ""
+  const ext = filePath.split('.').pop() || '';
   return responseFromFile(filePath, {
-    "Content-Type": contentTypes[ext] || "application/octet-stream",
-    "Cache-Control": pathname.startsWith("/assets/") ? "public, max-age=31536000, immutable" : "no-cache",
-  })
+    'Content-Type': contentTypes[ext] || 'application/octet-stream',
+    'Cache-Control': pathname.startsWith('/assets/')
+      ? 'public, max-age=31536000, immutable'
+      : 'no-cache',
+  });
 }
 
 Bun.serve({
   port: 80,
-  hostname: "0.0.0.0",
+  hostname: '0.0.0.0',
   fetch(req) {
-    const url = new URL(req.url)
-    const pathname = url.pathname
-    const filePath = resolve(distDir, pathname.slice(1))
-    const insideDist = filePath === distDir || filePath.startsWith(`${distDir}${sep}`)
+    const url = new URL(req.url);
+    const pathname = url.pathname;
+    const filePath = resolve(distDir, pathname.slice(1));
+    const insideDist = filePath === distDir || filePath.startsWith(`${distDir}${sep}`);
 
     if (!insideDist) {
-      return new Response("Forbidden", { status: 403 })
+      return new Response('Forbidden', { status: 403 });
     }
 
-    if (pathname !== "/" && existsSync(filePath)) {
-      return serveFile(filePath, pathname)
+    if (pathname !== '/' && existsSync(filePath)) {
+      return serveFile(filePath, pathname);
     }
 
-    if (!pathname.includes(".") && existsSync(indexPath)) {
-      return serveIndex()
+    if (!pathname.includes('.') && existsSync(indexPath)) {
+      return serveIndex();
     }
 
-    return new Response("Not Found", { status: 404 })
+    return new Response('Not Found', { status: 404 });
   },
-})
+});