refactor: remove unused monorepo tooling

Delete packages/ui and packages/utils (zero imports from apps/web),
remove Turborepo, inline tsconfig.base.json into web's tsconfig,
and simplify root scripts to use pnpm --filter directly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/tsconfig.json

@@ -1,14 +1,49 @@
 {
-  "extends": "../../tsconfig.base.json",
   "compilerOptions": {
-    "plugins": [{ "name": "next" }],
-    "paths": {
-      "@/*": ["./*"]
-    },
+    "target": "ESNext",
     "module": "ESNext",
     "moduleResolution": "bundler",
-    "noEmit": true
+    "lib": [
+      "ESNext",
+      "DOM",
+      "DOM.Iterable"
+    ],
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "noUncheckedIndexedAccess": true,
+    "resolveJsonModule": true,
+    "jsx": "react-jsx",
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
+    "paths": {
+      "@/*": [
+        "./*"
+      ]
+    },
+    "noEmit": true,
+    "allowJs": true,
+    "incremental": true
   },
-  "include": ["next-env.d.ts", "src", "app", "**/*.ts", "**/*.tsx"],
-  "exclude": ["node_modules"]
+  "include": [
+    "next-env.d.ts",
+    "src",
+    "app",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
 }