feat: add launch configuration for FastAPI and Vite in .claude/launch.json; include VSCode settings for pytest

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+  "python.testing.pytestArgs": [
+    "tests"
+  ],
+  "python.testing.unittestEnabled": false,
+  "python.testing.pytestEnabled": true
+}