docs: add Apache 2.0 LICENSE file and component/service reuse documentation

[Copilot]

Source files already declared SPDX-License-Identifier: Apache-2.0 but no LICENSE file existed in the repo, and the README had no documentation on available components or services.

Changes

• LICENSE — Added full Apache 2.0 license text, formalizing the rights already declared in file headers
• README.md — Expanded with:
  • Bilingual (PT/EN) license notice confirming code reuse is permitted
  • Full project structure map
  • Reusable component docs with usage examples: Button, ProductCard, CartDrawer, Assistant, ImageGenerator
  • Reusable service docs with usage examples: GeminiAdapter (chat + image gen), cache
  • Exported TypeScript types overview

Example — reusing the AI adapter in another app:

import { GeminiAdapter } from './services/aiAdapter';

const reply = await GeminiAdapter.sendMessage(history, 'Hello', 'fast');
const imageUrl = await GeminiAdapter.generateImage('minimalist white crib');

Reuse is permitted under Apache 2.0 — original license headers must be retained.

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