fix: Prevent deadlock in runComponent when Prepare fails

[weiliu1031]

issue: #45068 When component.Prepare() fails (e.g., net listener creation error), the sign channel was never closed, causing runComponent to block indefinitely at <-sign. This resulted in the entire process hanging after logging the error message.

Changes:

• Move close(sign) to defer statement in runComponent goroutine
• Ensures sign channel is always closed regardless of success/failure
• Allows proper error propagation through future.Await() mechanism

[sre-ci-robot]

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.50%. Comparing base (1ba75ee) to head (939ab43). :warning: Report is 4 commits behind head on master.

:x: Your project status has failed because the head coverage (76.50%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45609      +/-   ##
==========================================
+ Coverage   76.47%   76.50%   +0.02%     
==========================================
  Files        1863     1875      +12     
  Lines      290163   292052    +1889     
==========================================
+ Hits       221889   223420    +1531     
- Misses      60923    61226     +303     
- Partials     7351     7406      +55     

Components	Coverage Δ
Client	78.17% <ø> (ø)
Core	83.18% <ø> (ø)
Go	74.61% <ø> (+0.01%)	:arrow_up:
see 42 files with indirect coverage changes

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[weiliu1031]

/ci-rerun-ut-go

[weiliu1031]

/ci-rerun-ut-go

[chyezh]

/lgtm

[weiliu1031]

/ci-rerun-ut-go

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, weiliu1031

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