fix: filter key normalization

[avirtopeanu-ionos]

Commit aed0028 introduces a normalizer for filter keys which works in most cases i.e. filters.Name correctly normalizes to filters.name but breaks certain camelCase keys such as imageType, createdBy.

This PR introduces a normalization func which iterates through SDK Types and builds a filter map, and normalizes the filters correctly.

[Copilot]

Pull request overview

This PR fixes filter key normalization for the IONOS Cloud CLI. The previous approach used simple strings.ToLower() which broke camelCase API filter keys like imageType and createdBy by converting them to imagetype and createdby. The new approach builds a lookup map from SDK struct types using reflection, enabling case-insensitive input while preserving the correct camelCase form expected by the API.

Changes:

• Added internal/client/filter_keys.go with a reflection-based filter key normalization function that maps any-cased input to the correct camelCase API key
• Replaced strings.ToLower() with normalizeFilterKey() in builder.go's setFilters function
• Updated and expanded tests in builder_test.go to cover camelCase preservation, uppercase normalization, mixed-case merging, and unknown key pass-through

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
internal/client/filter_keys.go	New file implementing normalizeFilterKey(), buildFilterKeyMap(), and firstLower() using reflection on SDK property types to build a case-insensitive filter key lookup map
internal/client/builder.go	One-line change replacing strings.ToLower(parts[0]) with normalizeFilterKey(parts[0]) in setFilters
internal/client/builder_test.go	Updated existing tests and added new tests for camelCase preservation, uppercase normalization, mixed-case merging, and direct normalizeFilterKey unit tests

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud