fix: support plain custom NPCs on f6 beta

[ifBars]

What changed

• Detect the legacy ConsumeProductBehaviour.onConsumeDone member before initializing it.
• On 0.4.7f6, where the game removed that member, skip the old initialization so plain NPC construction can continue.

Closes #309 after this reaches a beta release. The published 3.2.1-beta.3 still fails on f6; see the issue update.

Reproduction and validation

Used isolated 0.4.7f6 installs: Steam build 25439857 (Mono) and 25439817 (IL2CPP). The released beta.3 package fails both legacy constructor and ConfigurePrefab contacts after loading a save, with missing onConsumeDone member errors. With this patch, the same live smoke reports PASS|legacy=issue309_legacy|modern=issue309_modern|scene=Main on both runtimes.

• MonoMelon restore/build: pass; contract tests: 723 passed.
• Il2CppMelon restore/build: pass; contract tests: 709 passed.
• Live f6 Mono and IL2CPP smoke: both contact paths pass after save load.

Compatibility

No public or protected S1API symbols, durable IDs, save data, or network formats change. Older game builds retain initialization of the legacy UnityEvent. The f6 build skips it because the native member is absent. The old-build branch was not rerun in-game for this follow-up; beta.3 had passed f5 Mono and IL2CPP smoke before this change.

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