feat(api): add surface and texture APIs for v0.2.0

[radicazz]

Summary

This PR adds complete surface and texture APIs to laya, providing type-safe C++20 wrappers for SDL3's 2D graphics pipeline. This represents a major feature addition (~960 lines of new code) that enables CPU-side pixel manipulation and GPU texture management.

Features Added

🎨 Surface API

• RAII wrapper for SDL_Surface with move-only semantics
• Creation methods: From dimensions, from BMP files, factory patterns
• Pixel operations: Fill, fill regions, clear, blit operations
• Transformations: Convert formats, duplicate, scale, flip (horizontal/vertical)
• State management: Alpha mod, color mod, blend modes, color keys
• Lock guards: Safe pixel access with automatic unlock
• File I/O: Load/save BMP (PNG support documented as pending SDL_image)

🖼️ Texture API

• RAII wrapper for SDL_Texture with move-only semantics
• Creation methods: From renderer, from surface, load from files
• Pixel updates: Direct updates, regional updates, surface-to-texture
• Lock guards: Safe streaming texture access
• State management: Alpha/color mod (byte and float), blend modes, scale modes
• Metadata caching: Avoids expensive SDL property queries
• Renderer integration: 9 texture rendering methods with rotation, flipping, transforms

🎯 Renderer Extensions

• Texture rendering with position, destination rect, source/dest rects
• Rotation support with custom pivot points
• Flipping (horizontal/vertical) support
• Unified flip_mode enum for consistency

Technical Details

• Lines Changed: 16 files, +452 insertions, -43 deletions
• New Files: 3 (surface tests, surface/texture documentation)
• SDL3 Integration: Proper use of properties API, error handling
• Error Handling: Consistent use of laya::error::from_sdl()
• RAII Compliance: All resources properly managed
• Move Semantics: Correct use of std::exchange pattern

Breaking Changes

None - This is a purely additive change. All existing APIs remain unchanged.

Testing

• ✅ Added comprehensive surface unit tests (15 test cases)
• ✅ Tests cover creation, operations, transformations, locking, metadata
• ✅ Integrated with existing doctest framework
• ⚠️ Texture tests pending (to be added in future PR)

Documentation

• ✅ Added docs/features/surfaces.md with usage examples
• ✅ Added docs/features/textures.md with renderer integration examples
• ✅ All public APIs documented with Doxygen comments
• ✅ Limitations clearly noted (PNG support, SDL_image dependency)

Code Quality Fixes

This PR also includes critical fixes identified during branch review:

1. API Consistency: Unified duplicate flip_mode/texture_flip enums
2. Complete Implementation: Added missing texture::update(const surface&) method
3. Documentation Accuracy: Fixed examples to match actual API signatures
4. Test Coverage: Added basic surface unit tests

Migration Guide

For new users:

// Create a surface
laya::surface surf{{256, 256}};
surf.fill(laya::colors::red);

// Convert to GPU texture
auto tex = laya::texture::from_surface(renderer, surf);

// Render with transformations
renderer.render(tex, {100, 100}, 45.0); // Position + rotati

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Note: This PR prepares the groundwork for v0.2.0 release. Version bump and tagging will be done on main after merge.

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