Add billing interfaces and provider packages

[cobycloud]

Summary

• add billing protocol interfaces and capability metadata under swarmauri_core
• implement pydantic-based billing models, mixins, and provider base classes in swarmauri_base
• publish Stripe (standards) and community billing provider stub packages with documentation and workspace registration

Testing

• uv run --directory pkgs/core --package swarmauri-core ruff format .【6f4339†L1-L8】
• uv run --directory pkgs/core --package swarmauri-core ruff check . --fix【ef8df2†L1-L2】
• uv run --directory pkgs/base --package swarmauri-base ruff format .【1c8d5f†L1-L3】
• uv run --directory pkgs/base --package swarmauri-base ruff check . --fix【e6c5c6†L1-L2】
• uv run --directory pkgs/standards/swarmauri_billing_stripe --package swarmauri_billing_stripe ruff format .【0a3bff†L1-L4】
• uv run --directory pkgs/standards/swarmauri_billing_stripe --package swarmauri_billing_stripe ruff check . --fix【13c1f8†L1-L2】
• uv run --directory pkgs/community/swarmauri_billing_square --package swarmauri_billing_square ruff format .【8f8a77†L1-L4】
• uv run --directory pkgs/community/swarmauri_billing_square --package swarmauri_billing_square ruff check . --fix【c15877†L1-L2】
• uv run --directory pkgs/community/swarmauri_billing_razorpay --package swarmauri_billing_razorpay ruff format .【705ad7†L1-L4】
• uv run --directory pkgs/community/swarmauri_billing_razorpay --package swarmauri_billing_razorpay ruff check . --fix【45432b†L1-L2】
• uv run --directory pkgs/community/swarmauri_billing_paystack --package swarmauri_billing_paystack ruff format .【582a27†L1-L4】
• uv run --directory pkgs/community/swarmauri_billing_paystack --package swarmauri_billing_paystack ruff check . --fix【e50b85†L1-L2】
• uv run --directory pkgs/community/swarmauri_billing_adyen --package swarmauri_billing_adyen ruff format .【a3afdc†L1-L4】
• uv run --directory pkgs/community/swarmauri_billing_adyen --package swarmauri_billing_adyen ruff check . --fix【114ca7†L1-L2】
• uv run --directory pkgs/community/swarmauri_billing_mock --package swarmauri_billing_mock ruff format .【b729e4†L1-L4】
• uv run --directory pkgs/community/swarmauri_billing_mock --package swarmauri_billing_mock ruff check . --fix【e5181e†L1-L2】

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https://chatgpt.com/codex/tasks/task_e_68f08b52852c83268c4450310a66a4eb