Feature: add shops expensive restorative items flag (-seri)

[HansGR]

Adds a flag -seri (--shops-expensive-restorative-items) that increases the base price of most restorative items. Basic restoratives are increased by a factor 3x by default; high restoratives (X-Potion, X-Ether) are increased by 2x. Elixirs and Megalixirs are not increased (as these are often sold to generate cash). This is intended to add challenge to the resource management by making what restoratives to purchase more of a decision.

This flag should be compatible with all other shop flags.

If there is interest we could add a scalar on this (e.g. -seri 5 for 5x increase in default cost and 3.33x increase in high restoratives). But that can be left for future work.

Resubmitted 6/4/26 to provide a clean patch to dev branch (1.4.4d).

[gemini-code-assist]

Code Review

This pull request introduces a new command-line flag -seri (--shops-expensive-restorative-items) to increase the base price of restorative items. A review comment identifies a compatibility issue where price randomization overwrites the scaled prices because of the execution order in mod(self). It is recommended to apply price randomization before the expensive scaling modifiers.

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