Extract precision API fallback with type-safe enum

[youngsuk-kim]

Refactor: Extract precision API fallback with type-safe enum

Remove 66 lines of duplicate try-catch code from RedisTemplate.
Replace hardcoded strings with PrecisionCommand enum.
Add logging and specific exception handling.

No functional changes, backward compatible.

Changes

• New: PrecisionApiHelper.java with PrecisionCommand enum
• Modified: RedisTemplate.java - updated expire(), expireAt(), getExpire()

Testing

• All existing tests pass
• No behavior changes

Closes #3274

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