feat: add WonderQ admin backend

Add FastAPI admin/public API service, database setup, Docker deployment files, docs, and tests.

app/serializers.py

@@ -0,0 +1,47 @@
+from datetime import datetime
+from sqlalchemy.inspection import inspect
+
+
+def encode_value(value):
+    if isinstance(value, datetime):
+        return value.isoformat()
+    if isinstance(value, list):
+        return [encode_value(item) for item in value]
+    if isinstance(value, dict):
+        return {key: encode_value(item) for key, item in value.items()}
+    return value
+
+
+def model_dict(instance, include: dict[str, object] | None = None) -> dict:
+    data = {column.key: encode_value(getattr(instance, column.key)) for column in inspect(instance).mapper.column_attrs}
+    if include:
+        for key, value in include.items():
+            data[key] = encode_value(value)
+    return data
+
+
+def product_dict(product) -> dict:
+    return model_dict(
+        product,
+        {
+            "destination": model_dict(product.destination) if product.destination else None,
+            "images": [model_dict(image) for image in sorted(product.images, key=lambda item: item.sortOrder)],
+        },
+    )
+
+
+def destination_dict(destination, include_count: bool = False) -> dict:
+    data = model_dict(destination, {"aliases": [model_dict(alias) for alias in destination.aliases]})
+    if include_count:
+        data["_count"] = {"products": len(destination.products)}
+    return data
+
+
+def lead_dict(lead) -> dict:
+    return model_dict(
+        lead,
+        {
+            "sourceProduct": {"id": lead.sourceProduct.id, "title": lead.sourceProduct.title} if lead.sourceProduct else None,
+            "assignedUser": {"id": lead.assignedUser.id, "name": lead.assignedUser.name} if lead.assignedUser else None,
+        },
+    )