feat(chat): integrate chat project into monorepo with full app structure

- Restructure chat as apps/mobile, apps/web, apps/landing, backend
- Add NestJS backend for secure Azure OpenAI API calls
- Remove exposed API key from mobile app (security fix)
- Add shared chat-types package
- Create SvelteKit web app scaffold
- Create Astro landing page scaffold
- Update pnpm workspace configuration
- Add project-level CLAUDE.md documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

chat/apps/web/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "@chat/web",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "scripts": {
+    "dev": "vite dev",
+    "build": "vite build",
+    "preview": "vite preview",
+    "prepare": "svelte-kit sync || echo ''",
+    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+    "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+    "type-check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json"
+  },
+  "devDependencies": {
+    "@sveltejs/adapter-auto": "^6.0.0",
+    "@sveltejs/kit": "^2.43.2",
+    "@sveltejs/vite-plugin-svelte": "^6.2.0",
+    "@tailwindcss/postcss": "^4.1.17",
+    "@tailwindcss/typography": "^0.5.19",
+    "autoprefixer": "^10.4.21",
+    "postcss": "^8.5.6",
+    "svelte": "^5.39.5",
+    "svelte-check": "^4.3.2",
+    "tailwindcss": "^4.1.17",
+    "typescript": "^5.9.3",
+    "vite": "^7.1.7"
+  },
+  "dependencies": {
+    "@manacore/shared-auth-ui": "workspace:*",
+    "@manacore/shared-branding": "workspace:*",
+    "@manacore/shared-i18n": "workspace:*",
+    "@manacore/shared-icons": "workspace:*",
+    "@manacore/shared-supabase": "workspace:*",
+    "@manacore/shared-tailwind": "workspace:*",
+    "@manacore/shared-theme": "workspace:*",
+    "@manacore/shared-theme-ui": "workspace:*",
+    "@manacore/shared-ui": "workspace:*",
+    "@supabase/supabase-js": "^2.81.1",
+    "marked": "^17.0.0"
+  }
+}