remove legacy GET /odp/search endpoint

Endpoint duplikat ini membingungkan platform lain karena menggunakan
GET method sementara endpoint canonical POST /search sudah tersedia.
Platform lain (Flutter, web) cukup gunakan POST /search dengan
body parameter device_type="ODP".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

delivery/controller/nearest_device_controller.go

@@ -36,8 +36,7 @@ func (c *NearestDeviceController) Route() {
 
 		nearestDevices.POST("/towers/search", c.getNearestTowers)
 		nearestDevices.GET("/towers/:id", c.getNearestTowerByID)
-
-		nearestDevices.GET("/odp/search", c.getNearestODPDevices)
+		// GET /odp/search removed — use POST /search with device_type="ODP"
 	}
 }