feat: use amazon-go for Amazon orders

[eshaffer321]

Summary

• replace the npm amazon-order-scraper adapter with the Go amazon-go client
• read Amazon auth from amazon-go cookie accounts / explicit cookie files
• remove the old scraper JSON parser and browser-data-dir config
• add auth preflight errors with actionable import-browser-profile recovery commands
• fix Amazon shipment charge matching to use item line totals

Dependency

Uses released amazon-go v0.3.0: https://github.com/eshaffer321/amazon-go/releases/tag/v0.3.0

Verification

• go test ./internal/adapters/providers/amazon -run TestOrder_GetItemsForChargeUsesLineTotalsForShipmentMatching -count=1
• go test ./...
• go test ./... -race
• go build -o itemize ./cmd/itemize/
• go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.4.0 run --timeout=5m
• go run ./cmd/amazon-go import-browser-profile -headless -profile-dir "$HOME/.itemize/amazon/amazon-wife" -account amazon-wife
• ./itemize amazon -dry-run -days 30 -max 5 -account amazon-wife -verbose

Dry-run result after refreshing amazon-wife cookies: Processed=4 Skipped=1 Errors=0.

[codecov]

Codecov Report

❌ Patch coverage is 76.74419% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.87%. Comparing base (8d948e8) to head (1b5039b).

Files with missing lines	Patch %	Lines
internal/adapters/providers/amazon/provider.go	76.52%	21 Missing and 6 partials ⚠️
internal/adapters/providers/amazon/order.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
- Coverage   59.95%   59.87%   -0.08%     
==========================================
  Files          47       46       -1     
  Lines        5262     5142     -120     
==========================================
- Hits         3155     3079      -76     
+ Misses       1920     1871      -49     
- Partials      187      192       +5     

Flag	Coverage Δ
unittests	59.87% <76.74%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/application/sync/handlers/amazon.go	65.28% <100.00%> (ø)
internal/domain/matcher/subset.go	0.00% <ø> (ø)
internal/infrastructure/config/config.go	81.08% <100.00%> (ø)
internal/adapters/providers/amazon/order.go	65.38% <50.00%> (+4.91%)	⬆️
internal/adapters/providers/amazon/provider.go	78.44% <76.52%> (+4.91%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.