refactor: internal/controller

[yottahmd]

Refactor package to make the code cleaner for future maintainability.

[codecov-commenter]

Codecov Report

Base: 85.21% // Head: 85.16% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (834404c) compared to base (a7b9e6e).
Patch coverage: 84.84% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   85.21%   85.16%   -0.05%     
==========================================
  Files          45       45              
  Lines        3564     3560       -4     
==========================================
- Hits         3037     3032       -5     
- Misses        385      387       +2     
+ Partials      142      141       -1     

Impacted Files	Coverage Δ
internal/database/database.go	81.81% <0.00%> (-1.52%)	⬇️
internal/runner/job.go	65.71% <66.66%> (ø)
internal/controller/status_reader.go	79.41% <79.41%> (ø)
internal/controller/controller.go	74.75% <98.11%> (+0.28%)	⬆️
agent.go	79.49% <100.00%> (ø)
cmd/restart.go	61.11% <100.00%> (ø)
cmd/status.go	71.42% <100.00%> (ø)
cmd/stop.go	80.00% <100.00%> (ø)

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