Bygg NeuroSemantics AI: minimal mobilapp, en backend, IaC och CI/CD

Ersätter den tidigare webappen på denna branch med ett fokuserat monorepo:

- apps/mobile: Expo/React Native med tre vyer (Welcome, Chat, Paywall),
  Cognito hosted UI-inloggning (Apple/Google/e-post) och In-App
  Purchase/Play Billing via en gemensam purchases-modul.
- services/api: en enda Lambda-backend — OpenAI Responses API med
  Markdown-kunskapsbas som systeminstruktioner, free tier-gräns i
  PostgreSQL (HTTP 402 -> paywall) och kvittoverifiering bakom ett
  delat PaymentProvider-interface (Apple/Google, Stripe kan läggas
  till för webb senare).
- infra: AWS CDK-stack med API Gateway (JWT-authorizer), Lambda,
  Cognito, Aurora Serverless v2 och Secrets Manager.
- db/migrations: minimal datamodell (users + usage), inga
  konversationer sparas.
- GitHub Actions: CI (lint, typecheck, test) och deploy från main.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0118DaxZR36RpnY524vRqx3z

eslint.config.js

@@ -1,26 +1,16 @@
-import js from "@eslint/js";
-import globals from "globals";
-import reactHooks from "eslint-plugin-react-hooks";
-import reactRefresh from "eslint-plugin-react-refresh";
-import tseslint from "typescript-eslint";
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
 
 export default tseslint.config(
-  { ignores: ["dist"] },
   {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ["**/*.{ts,tsx}"],
-    languageOptions: {
-      ecmaVersion: 2020,
-      globals: globals.browser,
-    },
-    plugins: {
-      "react-hooks": reactHooks,
-      "react-refresh": reactRefresh,
-    },
+    ignores: ['**/node_modules/', '**/dist/', '**/build/', '**/.expo/', '**/cdk.out/'],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
     rules: {
-      ...reactHooks.configs.recommended.rules,
-      "react-refresh/only-export-components": ["warn", { allowConstantExport: true }],
-      "@typescript-eslint/no-unused-vars": "off",
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
     },
   },
 );