Add product catalog recommender domain

[BerqiaMouad]

Summary

• Adds a distinct e-commerce/product-catalog recommender domain for aolabsai/ao_pyth#9.
• Includes a local 12-product catalog with category, price tier, sustainability, brand style, shipping speed, use case, shopper intent, and descriptions.
• Encodes products into the existing AO-compatible 8-bit input shape (arch_i = [3, 2, 1, 2]).
• Adds a Streamlit product recommender UI plus deterministic CLI/fallback behavior for reviewers without private AO packages.
• Adds unit tests covering encoding, filtering, deterministic ranking, feedback-driven ranking, and invalid category errors.

Validation

• python3 -m unittest tests/test_product_domain.py
• python3 -m py_compile product_domain.py product_recommender.py arch__ProductRecommender.py tests/test_product_domain.py
• python3 product_recommender.py
• git diff --check

Bounty

/claim #9

If accepted for the paid bounty, preferred payout is PayPal:
https://www.paypal.com/paypalme/MouadBERQIA

Transparency: AI-assisted with Codex; I reviewed the implementation and validation output before submitting.