feat(#1): Set up monorepo scaffold with pnpm workspaces + TurboRepo

Implements the foundational project structure including:
- pnpm workspaces configuration
- TurboRepo for build orchestration
- NestJS 11.1.12 API (apps/api)
- Next.js 16.1.6 web app (apps/web)
- Shared packages (config, shared, ui)
- TypeScript strict mode configuration
- ESLint + Prettier setup
- Vitest for unit testing (19 passing tests)

Fixes #1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/.swcrc

@@ -0,0 +1,18 @@
+{
+  "sourceMaps": true,
+  "jsc": {
+    "target": "es2022",
+    "parser": {
+      "syntax": "typescript",
+      "decorators": true
+    },
+    "transform": {
+      "legacyDecorator": true,
+      "decoratorMetadata": true
+    },
+    "keepClassNames": true
+  },
+  "module": {
+    "type": "es6"
+  }
+}