You can remove internal wall of flat as it is not load bearing wall 

2) it does not amount to carrying on structural alterations in flat 

3) obtain permission of housing society to do so 

It may come under structural changes or deviation hence you may better consult your architect about it before starting the process. 

Yes, it can be done as rightly suggested by you to separate kitchen and front room. There's no need to obtain permission as it does not alter the structure and it's not a load bearing arrangement.

yes, if this wall is not load-bearing then you can change it as per your choice without any permission

Yeah you can do that. Infact it is a temporary wall that has been erected.

Dear Sir/ Madam

If the said construction is not load bearing, you can take down without obtaining permission. hiwever to be on the safest side, please inform the Housing society about the construction.

-If your Sale agreement is having clause that, the members should not use the common areas and facilities for the purpose for which they are intended without hindering or encroaching upon the lawful rights of the other members, And the member shall not make any any structural modifications or alterations in his/her flat if such modification or alteration are likely to affect the building or to any flat , then you cannot do such alteration without getting the permission of the society. . 

- However, as the said plasterboard wall is not encroaching upon the right of other members, hence you can built the same after getting permission from the Society.