Add configurable RemoveUnusedQuerySchemas option (Issue #180)

[avgalex]

Summary

• Added RemoveUnusedQuerySchemas option (default: true) to SchemaGenerationOptions allowing users to opt out of the v7.0.4 schema cleanup
• When set to false, container type schemas created for [FromQuery]/[AsParameters] types are preserved in components/schemas for use by custom DocumentFilters
• Fixes regression reported by @thunderstatic in #180 (comment)
• Version bumped to 7.0.5

User-facing API

services.AddFluentValidationRulesToSwagger(options =>
{
    options.RemoveUnusedQuerySchemas = false; // preserve schemas for custom DocumentFilters
});

Changes

File	Change
ISchemaGenerationOptions.cs	Added RemoveUnusedQuerySchemas to interface and class (default true)
SchemaGenerationOptionsExtensions.cs	Copy new property in SetFrom()
FluentValidationOperationFilter.cs	Conditional snapshot/cleanup based on flag
FluentValidationDocumentFilter.cs	Conditional snapshot/cleanup based on flag
AsParametersTests.cs	4 new tests (default value, OperationFilter opt-out, DocumentFilter opt-out, DocumentFilter default)
CHANGELOG.md	v7.0.5 entry
version.props	Bumped to 7.0.5
ADR-002-configurable-schema-cleanup.md	Architecture decision record

Test plan

• All existing tests pass (default true preserves v7.0.4 behavior)
• Default_RemoveUnusedQuerySchemas_Should_Be_True — verifies default
• OperationFilter_Should_Preserve_Schemas_When_RemoveUnusedQuerySchemas_Is_False — opt-out works in OperationFilter
• DocumentFilter_Should_Preserve_Schemas_When_RemoveUnusedQuerySchemas_Is_False — opt-out works in DocumentFilter
• DocumentFilter_Should_Cleanup_ContainerType_Schemas_By_Default — default cleanup works in DocumentFilter
• Builds and tests pass on net8.0, net9.0, net10.0

🤖 Generated with Claude Code

[avgalex]

Replaced by release/v7.0.5 branch — hotfix off v7.0.4 without merging master (7.1.0-beta.1)