aspectran / aspectran / #5089

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Improve MyBatis transaction management with lazy session opening and intelligent routing

- Implement lazy session opening in SqlSessionAdvice to defer DB connection until actual usage
- Introduce intelligent routing in SqlSessionProvider to reuse open writable sessions by default
- Add 'reuseWritable' option to support both strict and intelligent routing modes
- Support stack-based aspect tracking to correctly handle nested transactions within an activity
- Optimize SqlSessionAgent to prevent premature session creation in getMapper() and getConfiguration()
- Enhance connection management by resetting read-only state before returning to the connection pool
- Provide specific error messages for resolving SqlSessionFactory in environments with multiple factories
- Refactor test suite to verify both strict and intelligent routing scenarios with descriptive naming
- Update documentation to reflect new flexibility in session opening strategies (Eager vs. Lazy)

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