feat: add WonderQ admin backend

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

requirements.txt

@@ -0,0 +1,11 @@
+fastapi>=0.115,<0.116
+uvicorn[standard]>=0.32,<0.33
+SQLAlchemy>=2.0,<2.1
+alembic>=1.14,<1.15
+psycopg[binary]>=3.2,<3.3
+pydantic-settings>=2.6,<2.7
+PyJWT>=2.10,<2.11
+bcrypt>=4.2,<4.3
+email-validator>=2.2,<2.3
+pytest>=8.3,<8.4
+httpx>=0.27,<0.28