refactor: restructure into npm workspaces monorepo

Move from a single-app layout to a monorepo with npm workspaces:

- apps/legacy: existing app, moved from src/
- apps/smartem: new app scaffold (hello world)
- packages/api: extracted from src/api/ with barrel export (@smartem/api)
- packages/ui: empty shell for shared components (@smartem/ui)

All legacy app imports updated from relative ../api/ paths to @smartem/api.
Root config (tsconfig, biome, lefthook, gitignore) updated for monorepo.
Shared compiler options extracted to tsconfig.base.json.

Also fix pre-existing useExhaustiveDependencies lint error in latentRep.tsx
(loaderData.squares.map → loaderData.squares in dependency array).

Author: vredchenko

.biomeignore

@@ -1,3 +1,3 @@
 build/**
 dist/**
-app/api/generated/**
+packages/api/src/generated/**

.gitignore

@@ -1,8 +1,8 @@
 .DS_Store
-/node_modules/
+node_modules/
 
 # Build output
-/dist/
+**/dist/
 /build/
 .idea/
 .env
@@ -13,4 +13,7 @@
 .claude/skills/*/test-results/
 
 # TanStack Router temp files
-.tanstack/
+**/.tanstack/
+
+# Generated API client
+packages/api/src/generated/

.prettierignore

@@ -12,4 +12,4 @@ dist/
 node_modules/
 
 # Ignore generated files
-app/api/generated/
+packages/api/src/generated/

index.html apps/legacy/index.htmlindex.html renamed to apps/legacy/index.html

@@ -0,0 +1,48 @@
+{
+  "name": "@smartem/legacy",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "dev:mock": "VITE_ENABLE_MOCKS=true vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc",
+    "router:generate": "tsr generate",
+    "router:check": "tsr generate && git diff --exit-code src/routeTree.gen.ts"
+  },
+  "dependencies": {
+    "@smartem/api": "*",
+    "@emotion/react": "^11.14.0",
+    "@emotion/styled": "^11.14.0",
+    "@mui/icons-material": "^7.3.7",
+    "@mui/material": "^7.0.2",
+    "@mui/x-charts": "^8.27.0",
+    "@tanstack/react-query": "^5.90.20",
+    "@tanstack/react-router": "^1.159.5",
+    "@tanstack/router-devtools": "^1.159.5",
+    "boring-avatars": "^2.0.4",
+    "d3-array": "^3.2.4",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.1.18",
+    "@tanstack/router-cli": "^1.159.4",
+    "@tanstack/router-vite-plugin": "^1.159.5",
+    "@types/d3-array": "^3.2.1",
+    "@types/node": "^25",
+    "@types/react": "^19.2.13",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.4",
+    "msw": "^2.12.10",
+    "tailwindcss": "^4.0.0",
+    "vite": "^7.3.1",
+    "vite-tsconfig-paths": "^6.1.0"
+  },
+  "msw": {
+    "workerDirectory": [
+      "public"
+    ]
+  }
+}

apps/legacy/package.json

@@ -1,6 +1,6 @@
 import { Alert, Button, Snackbar } from '@mui/material'
+import { checkApiVersion, logApiVersion } from '@smartem/api'
 import { useEffect, useState } from 'react'
-import { checkApiVersion, logApiVersion } from '../api/version-check'
 
 export function ApiVersionCheck() {
   const [versionMismatch, setVersionMismatch] = useState(false)