refactor(usecase): migrate tag operations to provider interfaces

[mpyw]

Summary

• Migrate param and secret TagUseCase to use provider.ParameterTagger and provider.SecretTagger interfaces
• Add NewParamAdapter() and NewSecretAdapter() factory functions to infra package
• Update CLI commands and GUI to use adapters instead of raw AWS clients
• Simplify test mocks to implement provider interfaces (~160 lines reduced)

Test plan

• All existing tests pass (make test)
• Lint passes (make lint)
• Build succeeds (go build ./...)

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.14%. Comparing base (f2021f7) to head (f6dc176).
⚠️ Report is 1 commits behind head on multicloud.

Files with missing lines	Patch %	Lines
internal/provider/aws/param/adapter.go	60.00%	1 Missing and 1 partial ⚠️
internal/provider/aws/secret/adapter.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           multicloud     #147      +/-   ##
==============================================
+ Coverage       86.60%   87.14%   +0.54%     
==============================================
  Files             139      139              
  Lines            8195     8170      -25     
==============================================
+ Hits             7097     7120      +23     
+ Misses            855      806      -49     
- Partials          243      244       +1     

Flag	Coverage Δ
e2e	64.75% <81.81%> (-2.73%)	⬇️
platform-darwin	64.38% <ø> (ø)
platform-linux	62.85% <ø> (ø)
platform-windows	73.46% <ø> (ø)
unittests	76.43% <18.18%> (-0.18%)	⬇️

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