test: add comprehensive test suite

[GeiserX]

Brings test coverage from 5% to 85%+ with unit tests across all packages (100% for all testable packages, only cmd/server/main.go wiring excluded).

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b01a1651-e27a-479e-bfa6-d6da62331b2e

📥 Commits

Reviewing files that changed from the base of the PR and between c5df5a3 and 146caa9.

📒 Files selected for processing (11)

• client/pumperly_test.go
• internal/resources/config_test.go
• internal/resources/exchange_rates_test.go
• internal/resources/stats_test.go
• internal/tools/calculate_route_test.go
• internal/tools/geocode_test.go
• internal/tools/helpers_test.go
• internal/tools/nearest_stations_test.go
• internal/tools/route_stations_test.go
• internal/tools/stations_in_area_test.go
• version/version_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/comprehensive-coverage

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