[ISSUE #10872] fix(broker): reject overflowing timer delays

[yuluo-yx]

Which Issue(s) This PR Fixes

• Fixes [Bug] Overflowing relative timer delays can be treated as immediate #10872

Brief Description

Relative timer delay conversion now uses exact long arithmetic. Seconds-to-milliseconds and current-time addition overflow are rejected through the existing WHEEL_TIMER_MSG_ILLEGAL path instead of wrapping into an immediate timestamp.

How Did You Test This Change?

• mise exec java@zulu-8.94.0.17 -- mvn -pl broker -am -DskipITs -Dtest=HookUtilsTest -Dsurefire.failIfNoSpecifiedTests=false test (3 tests passed)
• Checkstyle and SpotBugs passed in the same Maven reactor.
• git diff --check and the 400-line scope gate passed.
• Not run: full repository build, container tests, or end-to-end tests.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.31%. Comparing base (fd0c959) to head (9ce2c14).

Files with missing lines	Patch %	Lines
...ava/org/apache/rocketmq/broker/util/HookUtils.java	80.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10882      +/-   ##
=============================================
- Coverage      48.39%   48.31%   -0.09%     
+ Complexity     13562    13538      -24     
=============================================
  Files           1380     1380              
  Lines         101165   101168       +3     
  Branches       13127    13127              
=============================================
- Hits           48962    48882      -80     
- Misses         46233    46294      +61     
- Partials        5970     5992      +22     

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[RockteMQ-AI]

LGTM. Trivial change, looks good.

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