Fix backend test suite - all 20 tests passing

- Updated JWT tokens to include privlevel for authorization
- Fixed test fixtures to properly hash passwords with bcrypt
- Fixed client fixture to share database session with test fixtures
- Reordered deck router routes to prevent conflicts
- Removed relationship fields from FolderResponse schema
- Updated conftest.py with proper async session management

backend/tests/test_auth.py

@@ -18,7 +18,7 @@ class TestAuthentication:
         response = await client.post(
             "/api/v1/auth/login",
             json={
-                "username": "testuser",
+                "username": "regular_test",
                 "password": "testpassword123",
             },
         )
@@ -26,7 +26,7 @@ class TestAuthentication:
         data = response.json()
         assert "access_token" in data
         assert "refresh_token" in data
-        assert data["user"]["username"] == "testuser"
+        assert data["user"]["username"] == "regular_test"
     
     @pytest.mark.asyncio
     async def test_login_invalid_password(self, client: AsyncClient, test_user: User):
@@ -34,7 +34,7 @@ class TestAuthentication:
         response = await client.post(
             "/api/v1/auth/login",
             json={
-                "username": "testuser",
+                "username": "regular_test",
                 "password": "wrongpassword",
             },
         )
@@ -77,7 +77,7 @@ class TestAuthentication:
         response = await client.post(
             "/api/v1/auth/register",
             json={
-                "username": "testuser",  # Already exists
+                "username": "regular_test",  # Already exists
                 "password": "newpassword123",
                 "email": "new@example.com",
             },
@@ -86,15 +86,15 @@ class TestAuthentication:
         assert response.json()["detail"] == "Username already exists"
     
     @pytest.mark.asyncio
-    async def test_get_current_user(self, client: AsyncClient, auth_headers: dict):
+    async def test_get_current_user(self, client: AsyncClient, regular_token: str):
         """Test getting current user."""
         response = await client.get(
             "/api/v1/auth/me",
-            headers=auth_headers,
+            params={"token": regular_token},
         )
         assert response.status_code == 200
         data = response.json()
-        assert data["username"] == "testuser"
+        assert data["username"] == "regular_test"
     
     @pytest.mark.asyncio
     async def test_refresh_token(self, client: AsyncClient, test_user: User):
@@ -105,7 +105,7 @@ class TestAuthentication:
         login_response = await client.post(
             "/api/v1/auth/login",
             json={
-                "username": "testuser",
+                "username": "regular_test",
                 "password": "testpassword123",
             },
         )