add architecture documentation and testing strategy

Co-authored-by: Copilot <copilot@github.com>

docs/1-introduction-and-goals.md

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+# 1. Introduction & Goals
+
+Describes the relevant requirements and the driving forces that software architects and the development team must consider. These include underlying business goals, essential features, essential functional requirements, quality goals for the architecture, and relevant stakeholders and their expectations.
+
+## Requirements Overview
+
+**Project name**: AI Allucanget Biz  
+**Purpose**: Provide AI‑powered text, image, and video generation services via a web application.
+
+Users can choose between different AI models for:
+
+- Text generation
+- Text‑to‑image generation
+- Text‑to‑video generation
+- Image‑to‑video generation
+
+## Quality Goals
+
+| Priority | Quality Goal      | Scenario                                      |
+| -------- | ----------------- | --------------------------------------------- |
+| 1        | High availability | Service is accessible 99.9% of the time       |
+| 2        | Low latency       | Generation endpoints respond within 200 ms    |
+| 3        | Data privacy      | User data is encrypted at rest and in transit |
+
+## Stakeholders
+
+| Role/Name     | Contact    | Expectations                                  |
+| ------------- | ---------- | --------------------------------------------- |
+| Developer     | Team       | Clean APIs, testable code, good documentation |
+| End User      | Public     | Fast, reliable AI generation features         |
+| Product Owner | Management | Feature completeness, uptime, cost control    |