Front disk brake squealing
Presuming you were thorough with your cleaning and the rotor was left with no residue of any kind (I achieve this on rotors I suspect of being oil or greased contaminated by either using brake cleaner or by finishing with alcohol if I'm using detergent/soap), and also presuming the front caliper isn't having a fluid leak that's causing oil to immediately contaminate the system even after cleaning (pull the pads you just installed and check everywhere for oil, particularly behind the back plates where the pistons contact), it sounds like a lot of the symptoms of the front rotor being glazed.

A glazed rotor is caused by overheating and will cause both noise and diminished power. There are ways of sanding down and breathing new life into them, but just replacing them can often make more sense, especially on a basic one with some years of regular use on it anyway. You could do a simple test and swap your rear onto the front, assuming they're the same size.