fix: update Jackson imports for Spring Boot 4.x / Jackson 3.x compatibility

[Copilot]

Spring Boot 4.x bundles Jackson 3.x, which relocated its core packages from com.fasterxml.jackson to tools.jackson, breaking compilation.

Changes

• ProductClient.java: Update imports to tools.jackson namespace:
  • com.fasterxml.jackson.databind.ObjectMapper → tools.jackson.databind.ObjectMapper
  • com.fasterxml.jackson.core.type.TypeReference → tools.jackson.core.type.TypeReference
  • Remove JsonMappingException catch blocks — JacksonException in Jackson 3.x now extends RuntimeException (unchecked), eliminating the need to wrap and rethrow as IOException

// Before
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

// ...
try {
    ObjectMapper mapper = new ObjectMapper();
    Product product = mapper.readValue(..., Product.class);
    return product;
} catch (JsonMappingException e) {
    throw new IOException(e);
}

// After
import tools.jackson.core.type.TypeReference;
import tools.jackson.databind.ObjectMapper;

// ...
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(..., Product.class);

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