Purpose of change (The Why)

fixes #8243

Describe the solution (The How)

• Cache tool-speed multiplier in ACT_CRAFT activity and reuse it during craft turns.
• Reuse cached tool multiplier in craft progress calculation instead of recomputing each update.
• Initialize cache fields for both fresh craft start and resume paths.

Testing

spawn a vehicle, fill it with gazillion cargo, craft something. i used private save file from original issue raiser.

result: 32.7s -> 2.7s (12.11x, initial), 1.5s (21.8x, cached)

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.