Code quality and maintenance workflow improvements

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{yml,yaml}]
+indent_size = 2

docs/CODE_STYLE.md

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+# Code Style Guidelines
+
+## Kotlin Style
+
+MediaKit follows:
+- Kotlin-first APIs
+- Readable code
+- Minimal public APIs
+- Clear separation of responsibilities
+
+## General Rules
+
+- Prefer immutable data where possible
+- Keep functions focused
+- Avoid large god classes
+- Prefer composition over deep inheritance
+
+## SDK Priorities
+
+Higher priority than feature count:
+- Stability
+- Readability
+- Maintainability
+- Bitmap safety
+- Lifecycle correctness
+
+## Public API Guidelines
+
+- Keep APIs predictable
+- Avoid leaking internal implementation
+- Prefer builder-style APIs when useful
+- Keep module boundaries clean

docs/MAINTENANCE_GUIDE.md

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+# Maintenance Guide
+
+## Goals
+
+MediaKit maintenance should focus on:
+- Stability
+- Backward compatibility
+- Lightweight architecture
+- Reliable media handling
+
+## Recommended Maintenance Areas
+
+### Image Picker
+- Permission flow validation
+- Lifecycle testing
+- Camera integration testing
+- URI handling verification
+
+### Image Cropper
+- Crop accuracy validation
+- Bitmap memory monitoring
+- Matrix transformation validation
+- Large image testing
+
+## Release Maintenance
+
+Before releases:
+- Verify CI builds
+- Review public API changes
+- Update changelog
+- Validate sample app
+
+## Long-Term Direction
+
+MediaKit should evolve carefully while keeping APIs stable and modular.