docs: Write quetza docs

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

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+---
+title: Troubleshooting
+weight: 5
+---
+
+
+**Quetza** troubleshooting focuses on diagnosing structural and conceptual issues. Because of its convention-based nature, most errors are silent (missing files) rather than noisy (stack traces).
+
+## Common Issue Categories
+
+{{% cards %}}
+  {{< card link="diagnostics" title="Diagnostics Guide" icon="exclamation" subtitle="Solutions for module discovery, command registration, and state leaks." >}}
+{{% /cards %}}