0219d7e6e1
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Add tests covering the main configuration loading path which was previously untested (only ClassifyTargets and PSL logic had tests). New test coverage: - New() constructor with default values, env overrides, and error cases - buildConfig() interval parsing with fallback to defaults on invalid input - setupViper() env prefix binding and default value registration - parseCSV() edge cases: whitespace, trailing/leading commas, empty segments - configureDebugLogging() debug mode activation - StatePath() path construction with various DataDir values - ErrNoTargets sentinel error for missing/empty targets - PORT env without DNSWATCHER_ prefix (compatibility) - Target classification into domains vs hostnames via PSL - Invalid targets (public suffixes) rejected with clear error Coverage for internal/config increased from 23% to 92.5%.