cPanel is a commercially sold control panel used for shared servers. I asked because a lot of people use it as a generic term for "control panel", when it is in fact it is a specific product name. Lunarpages used to use it exclusively, and it's still on all the old servers. "LPCP" is LunarPages Control Panel, a homebrewed control panel that LP has been using on all its new servers for several years now. If you're on a Linux-based shared server, you have one or the other. It will tell you when you sign on to your control panel.
I think all the cPanel servers used "localhost" (i.e., the MySQL server was running on the same physical machine as the sites themselves), while the LPCP servers offload MySQL server duties onto a separate, named machine (e.g., SQL012.lunariffic.com). Support should certainly be able to tell you where your MySQL server is, if it's not spelled out in your server control panel. If there's confusion, perhaps you're asking the question in a very confused manner (talking about "MySQL files", which are irrelevant to you).
By the way, it's a good idea NOT to give out your LP account name in public, but that's water under the bridge now. Someone knowing your account name and database and user names might guess your password and use that information to access your database and do damage or spy. At the least, don't keep sensitive information on it, such as financial information (never keep credit card numbers on your database, unless you pay for an expensive PCI-DSS security audit).
755 and 644 are the normal default permissions for directories and files. In some cases you may need or want to restrict those permissions to prevent a program from overwriting directories or files.
I haven't looked at SMF for a while, but 2.something is the current version. I don't think they're at version 3 yet.
You don't have or need access to MySQL files. You may just be confusing tech support by continuing to talk about the files, rather than access to your database. For SMF to import and convert the database, it does not need a working IkonForum installation, just a working database.