fix(wecom): standardize commercial plan flow

[FinleyGe]

Summary

• Remove WeCom-specific plan and cashier dependencies.
• Use FastGPT standard plans and synchronize License purchase and renewal.
• Trigger cancellation requests from WeCom cancellation events and cancel them after renewed authorization.

Verification

• WeCom License, event, and cancellation tests pass.
• Plan utility tests pass.

[github-actions]

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	34.95%	3430 / 9814
🔵	Statements	34.8%	3618 / 10394
🔵	Functions	28.63%	674 / 2354
🔵	Branches	29.6%	1744 / 5891

File Coverage

No changed files found.

Generated in workflow #2934 for commit 4a60ab1 by the Vitest Coverage Report Action

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🕒 Time: 2026-09-01 20:23:05 (UTC+8)