Fix matdyn parser column offset and ph.py parameter handling

[LIU-Binbin]

1, The parser assumed 3 values per k-point line but matdyn.x outputs 4 (kx, ky, kz, weight), causing all phonon frequencies to be incorrectly parsed with a cumulative offset.
Fix: Correct k-point stride from 3 to 4 for proper frequency parsing in parse_raw_matdyn_phonon_file() in matdyn.py

2. PhCalculation: Missing parameter normalization and unsafe INPUTPH access.
   Fix:

1. Restored parameter case normalization (_uppercase_dict / _lowercase_dict)
2. Changed to safe dict access: parameters.get('INPUTPH', {}).get('electron_phonon')

[dbidoggia]

This is a good point. Indeed the weights were indeed introduced in qe7.4 (https://gitlab.com/QEF/q-e/-/commit/2e4ee8f50a44aaef4d65f7a994d83fed9436aee9).

However, simply changing the offset increments is not a good solution, as it would break compatibility with older QE versions where these weights are not present. I think that either the increment is choose according to the version parsed from stdout or a new logic for parsing ph frequencies should be implemented