fix: Handle OPTIONS requests for search route to prevent CORS duplication

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -544,6 +544,10 @@ async def search(request):
     return web.json_response({})
 
 
+async def options_handler(request):
+    return web.Response()
+
+
 async def latest(request):
     result = dict()
     api_key = request.rel_url.query.get('api_key', '')
@@ -598,6 +602,7 @@ if __name__ == '__main__':
     app.router.add_post('/owntracks', owntracks)
     app.router.add_get('/history/{measurement}/{name}', history)
     app.router.add_post('/search/{measurement}/{name}', search)
+    app.router.add_route('OPTIONS', '/search/{measurement}/{name}', options_handler)
     app.router.add_get('/latest', latest)
 
     sensors.add(ThermostatSensor('thermostat2', '192.168.69.152', 'Venstar'))