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/mobile/package.json

@@ -0,0 +1,69 @@
+{
+  "name": "@chat/mobile",
+  "version": "1.0.0",
+  "main": "expo-router/entry",
+  "type": "commonjs",
+  "scripts": {
+    "dev": "expo start --dev-client",
+    "start": "expo start --dev-client",
+    "ios": "expo run:ios",
+    "android": "expo run:android",
+    "build:dev": "eas build --profile development",
+    "build:preview": "eas build --profile preview",
+    "build:prod": "eas build --profile production",
+    "prebuild": "expo prebuild",
+    "lint": "eslint \"**/*.{js,jsx,ts,tsx}\" && prettier -c \"**/*.{js,jsx,ts,tsx,json}\"",
+    "format": "eslint \"**/*.{js,jsx,ts,tsx}\" --fix && prettier \"**/*.{js,jsx,ts,tsx,json}\" --write",
+    "web": "expo start --web",
+    "supabase:cli": "node --experimental-json-modules scripts/supabase-cli.js",
+    "supabase:update-models": "node --experimental-json-modules scripts/update_models.js",
+    "supabase:setup": "node --experimental-json-modules scripts/setup_supabase.js",
+    "supabase:setup-spaces": "node --experimental-json-modules scripts/spaces/setup_spaces.js"
+  },
+  "dependencies": {
+    "@expo/vector-icons": "^14.0.0",
+    "@react-native-async-storage/async-storage": "1.23.1",
+    "@react-navigation/bottom-tabs": "^7.0.5",
+    "@react-navigation/drawer": "^7.0.0",
+    "@react-navigation/native": "^7.0.3",
+    "@supabase/supabase-js": "^2.38.4",
+    "expo": "^52.0.39",
+    "expo-constants": "~17.0.8",
+    "expo-dev-client": "~5.0.4",
+    "expo-dev-launcher": "^5.0.17",
+    "expo-linking": "~7.0.5",
+    "expo-router": "~4.0.6",
+    "expo-status-bar": "~2.0.1",
+    "expo-system-ui": "~4.0.8",
+    "expo-web-browser": "~14.0.2",
+    "nativewind": "latest",
+    "node-fetch": "^2.7.0",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
+    "react-native": "0.76.7",
+    "react-native-gesture-handler": "~2.20.2",
+    "react-native-markdown-display": "^7.0.2",
+    "react-native-reanimated": "3.16.2",
+    "react-native-safe-area-context": "4.12.0",
+    "react-native-screens": "~4.4.0",
+    "react-native-web": "~0.19.10"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.20.0",
+    "@types/react": "~18.3.12",
+    "@typescript-eslint/eslint-plugin": "^7.7.0",
+    "@typescript-eslint/parser": "^7.7.0",
+    "dotenv": "^16.4.7",
+    "eslint": "^8.57.0",
+    "eslint-config-universe": "^12.0.1",
+    "prettier": "^3.2.5",
+    "prettier-plugin-tailwindcss": "^0.5.11",
+    "tailwindcss": "^3.4.0",
+    "typescript": "~5.3.3"
+  },
+  "eslintConfig": {
+    "extends": "universe/native",
+    "root": true
+  },
+  "private": true
+}