CONV-309: Add API resource response DTOs

[menvil]

Summary

• All controllers already use Laravel Resources (FileResource, ConversionResource, ConverterResource, TargetFormatResource)
• Adds shape tests verifying internal fields (stored_path, token_hash, options_json) are never exposed
• Verifies PHP class names don't leak in converter keys

Test plan

• File resource: no stored_path, no checksum in response
• Converter resource: no backslashes in key field
• Conversion resource: no converter_key, options_json, user_id
• No token_hash in any response
• composer test passes (588 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Added tests that lock down API v1 resource response DTOs to prevent leaking internal fields and class names. Addresses Linear CONV-309 by verifying file, conversion, converter, and targets endpoints exclude stored_path, checksum, converter_key, options_json, user_id, and token_hash, and that converter key has no backslashes.

^{Written for commit 0cd8a10. Summary will update on new commits.}

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