Add core module structure

pixstrip-core/src/config.rs

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+// Application configuration

pixstrip-core/src/error.rs

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+// Error types

pixstrip-core/src/lib.rs

@@ -1,3 +1,10 @@
+pub mod config;
+pub mod error;
+pub mod operations;
+pub mod pipeline;
+pub mod preset;
+pub mod types;
+
 pub fn version() -> &'static str {
     env!("CARGO_PKG_VERSION")
 }

pixstrip-core/src/operations/mod.rs

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+// Image processing operations

pixstrip-core/src/pipeline.rs

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+// Processing pipeline

pixstrip-core/src/preset.rs

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+// Preset management

pixstrip-core/src/types.rs

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+// Core domain types for image processing