Reject partial numeric strings in Pharmacode validation

[xiehuanyi]

Pharmacode validation checks only the range of parseInt(data), so inputs such as 3.5, 3junk, and 3e4 are accepted and encode the value 3 while displaying different text. Pharmacode input is an integer, as described by the project documentation and the Laetus guide linked in the encoder.

Reject non-digit input before the existing range check. Digit-only leading-zero values remain accepted, as do the existing 3 and 131070 boundaries. Regression cases cover decimals, numeric suffixes, scientific notation and whitespace, including final line terminators.

The new regression fails on the original code. Validation: the full npm test suite passes with 110 tests on Node 18 and the repository's canvas dependency. The changed source passes ESLint with the repository config's obsolete predef key normalized outside the patch. The existing gulp lint command is blocked by that invalid config, and normalized whole-source lint reports unrelated existing errors. git diff --check passes. No generated bin/dist or dependency changes are included.

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