1. How long can i use all these proofs for filing a divorce and Sec 498 police complain on the man
You are right that if her modesty is hit or if her name is being damaged, she may go to any extent including filing false complaints against you on the grounds of cruelty and dowry demand harassment too.
She may even resort to a complaint on the grounds of domestic violence.
Hence, as she is not changing her habits despite stern warnings, you may ask her sign divorce papers for divorce on mutual consent grounds which will be safe for both.
2. If i pardon her now can she after 6/12/24 months file for divorce on some other grounds to gain from alimony and child custody ? What recourse i have that time.
What she will do in the future cannot be predicted by anyone, but on such an occasion, you may seek custody of child by pleading her adulterous life in the past (if your can prove her current adulterous life too, it will be more beneficial to you) and plead before the court that it will affect the moral and well being of the child if allowed to remain in her custody a nd the alimony claim too can be repudiated on the same grounds.
3. How to protect from false allegations of domestic violence or torture since she might want to divorce case not on adulterous grounds
Read my answer to your first question which explains.
4. We have a joint locker which is operated by either or but since she has the key i fear she might take away all jewellery from there. How can i put a restriction on single person operation of locker.
You cannot object to her taking away her own jewels however, you may give an application to the bank that you withdraw from the joint ownership and may instruct bank to not to allow her to open the locker in your absence and you may follow necessary formalities of the bank in this regard accordingly.
5. How to file the police complain against the man involved with my wife and where to file ?
You can file a police complaint under section 497 against the adulterer within your jurisdiction.
6. What are the kind of costs involved in all the above filling and complain and divorce proceedings
The lawyer whom you may engage may be the correct person to explain the costs involved because lawyer's fee cannot be guessed by another lawyer.
7. If i decided to give her one more chance to stay on is there any statement that can be secured from her that will say that she was guilty of adulterous relation and asking for pardon and vow not to repeat these mistakes again and be true and faithful to marraige
It depends on how you have decided to handle this issue.