feat: implement Auth endpoints for web dashboard

tests/test_web_api.py

@@ -0,0 +1,47 @@
+import os
+from typing import Generator
+import pytest
+from fastapi.testclient import TestClient
+from decnet.web.api import app, repo
+
+
+@pytest.fixture(autouse=True)
+def setup_db() -> Generator[None, None, None]:
+    repo.db_path = "test_decnet.db"
+    if os.path.exists(repo.db_path):
+        os.remove(repo.db_path)
+    
+    # Yield control to the test function
+    yield
+    
+    # Teardown
+    if os.path.exists(repo.db_path):
+        os.remove(repo.db_path)
+
+
+def test_login_success() -> None:
+    with TestClient(app) as client:
+        # The TestClient context manager triggers startup/shutdown events
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": "admin", "password": "admin"}
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert "access_token" in data
+        assert data["token_type"] == "bearer"
+
+
+def test_login_failure() -> None:
+    with TestClient(app) as client:
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": "admin", "password": "wrongpassword"}
+        )
+        assert response.status_code == 401
+        
+        response = client.post(
+            "/api/v1/auth/login", 
+            json={"username": "nonexistent", "password": "wrongpassword"}
+        )
+        assert response.status_code == 401