refactor and fix some lint issue

[kazeburo]

PR Type

Bug fix, Enhancement

---

Description

• Move option validation into flagrun.Validator.

• Preserve connection errors with %w wrapping.

• Remove obsolete dialer and build settings.

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Diagram Walkthrough

flowchart LR
  cli["CLI options"]
  validator["flagrun.Validator"]
  run["Opt.Run"]
  connection["FTP connection"]
  cli -- "validate" --> validator
  validator -- "valid options" --> run
  run -- "connect" --> connection

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File Walkthrough

	Relevant files
Enhancement	main.go Integrate option validation and modernize connection handling main.go Register verifyOptions with flagrun.Validator instead of calling it in Run. Update method signatures for the validator and runner interfaces. Wrap connection errors with %w and remove DualStack from the dialer. +5/-9
Tests	main_test.go Adapt validation tests to updated method signature              main_test.go Pass an argument slice to verifyOptions in existing tests. +1/-1
Configuration changes	Makefile Simplify build linker flags to version only                            Makefile Remove Git commit detection and commit injection from linker flags. +1/-2

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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