⚡ Bolt: Cache repetitive Printify API variant queries

[merg357]

• 💡 What: Added @functools.lru_cache(maxsize=None) and immutable tuple returns to get_variants and get_blueprint_variants functions across scripts.
• 🎯 Why: Prevent N+1 API calls when creating multiple products that reuse the same blueprints/providers.
• 📊 Impact: Significantly reduces network bottleneck during bulk product creation loops.
• 🔬 Measurement: Observe faster script execution times and fewer network requests.

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PR created automatically by Jules for task 15619491024033322506 started by @merg357

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