Correct type25 contact distance initialization to use EP30

[Copilot]

Description of the feature or the bug

Contact type25 distance calculations were initialized with the too-small sentinel EP20, risking premature minimum selection and incorrect gap/penetration evaluation.

Description of the changes

• Distance/penetration initialization now uses EP30 in type25 distance routines
  • i25dst3_1.F
  • i25dst3_21.F

Example:

! Before
PENT(1:JLT,1:4) = EP20
DD  (1:JLT,1:4) = EP20
DIST(1:JLT)     = EP20
LD(1:JLT)       = EP20

! After
PENT(1:JLT,1:4) = EP30
DD  (1:JLT,1:4) = EP30
DIST(1:JLT)     = EP30
LD(1:JLT)       = EP30

Original prompt

Can you search for any algorithmic bug in contact type20 interfaces (files with 25 in their name)?

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