docs: Write quetza docs

services/docs/content/en/quetza/_index.md

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+---
+title: Quetza Bot
+weight: 1
+type: docs
+cascade:
+  type: docs
+---
+
+**Quetza** is a modular Discord bot framework built with TypeScript and Discord.js. It transforms feature development from core modification into independent module addition.
+
+## Project Vision
+
+The framework addresses the fundamental challenge of extensible bot design: providing a scalable architecture where functionality can be added without increasing system complexity or coupling.
+
+## Documentation Sections
+
+{{% cards %}}
+  {{< card link="getting-started" title="Getting Started" icon="lightning-bolt" subtitle="Understand the core philosophy and architecture of Quetza." >}}
+  {{< card link="guides" title="Guides" icon="book-open" subtitle="Step-by-step instructions for development and deployment." >}}
+  {{< card link="recipes" title="Recipes" icon="beaker" subtitle="Strategic patterns for common bot features." >}}
+  {{< card link="concepts" title="Concepts" icon="light-bulb" subtitle="Deep dive into the philosophy and design principles." >}}
+  {{< card link="troubleshooting" title="Troubleshooting" icon="shield-exclamation" subtitle="Diagnose and fix common issues." >}}
+{{% /cards %}}
+
+## Key Features
+
+*   **Modular Architecture:** Features are plugins, not core modifications.
+*   **TypeScript First:** Built for type safety and developer experience.
+*   **Zero-Config Discovery:** Filesystem-based module registration.
+*   **State Management:** Built-in patterns for guild-scoped services.