refactor(app): accept client dependency for better testability #51
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- Refactor App.New() to accept PostgreSQLClient interface parameter - Add NewDefault() convenience constructor for production use - Update all tests to inject mock clients via New() constructor - Remove tight coupling between App and PostgreSQLClientImpl - Enable dependency injection pattern for improved testability This follows constructor dependency injection pattern and makes it easier to test App without database dependencies. Implements #28
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sgaunet
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This follows constructor dependency injection pattern and makes it easier
to test App without database dependencies.
Implements #28