Add plant care recommender domain

[starburtMr]

Summary

• Adds an indoor plant care recommender domain with a local care-action catalog.
• Encodes plant type, light level, effort, and care goal into the same 8-bit AO-compatible input shape used by the recommender architecture.
• Adds a Streamlit demo plus a deterministic CLI fallback so reviewers can run it without optional AO packages.
• Adds unit tests for encoding, goal preferences, light preferences, feedback ranking, and invalid input handling.

Bounty

/claim #9

PayPal payout email: 1977995433@qq.com

Validation

• python3 -m unittest tests/test_plant_domain.py
• python3 plant_recommender.py
• python3 -m py_compile plant_domain.py plant_recommender.py arch__PlantRecommender.py
• git diff --check