feat: add WonderQ admin backend

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

tests/test_schemas.py

@@ -0,0 +1,13 @@
+import pytest
+from pydantic import ValidationError
+from app.schemas import LeadCreateIn, ProductCreateIn
+
+
+def test_lead_phone_is_normalized():
+    lead = LeadCreateIn(phone="  187  8617 4929  ")
+    assert lead.phone == "187 8617 4929"
+
+
+def test_product_title_requires_two_chars():
+    with pytest.raises(ValidationError):
+        ProductCreateIn(title="A")