fix: use sync route handlers to avoid blocking the event loop

Convert home() and protected_route() from async def to def so FastAPI
runs them in a threadpool, preventing synchronous OAuth calls from
blocking the async event loop.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: KomanRudden

kinde_fastapi/examples/example_app.py

@@ -64,7 +64,7 @@
 
 # Example home route
 @app.get("/", response_class=HTMLResponse)
-async def home():
+def home():
     """
     Home page that shows different content based on authentication status.
     """
@@ -119,7 +119,7 @@ async def home():
 
 
 @app.get("/protected")
-async def protected_route():
+def protected_route():
     """
     Example of a protected route that requires authentication.
     Redirects to login if not authenticated.