feat: scaffold Cargo workspace with idfoto-core and idfoto-cli

crates/idfoto-core/Cargo.toml

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+[package]
+name = "idfoto-core"
+version = "0.1.0"
+edition = "2021"
+description = "Core library for idfoto password manager"
+
+[dependencies]
+thiserror = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+argon2 = "0.5"
+chacha20poly1305 = "0.10"
+rand = "0.8"
+sha2 = "0.10"
+ed25519-dalek = { version = "2", features = ["rand_core"] }
+image = { version = "0.25", default-features = false, features = ["jpeg"] }
+
+[dev-dependencies]

crates/idfoto-core/src/error.rs

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+// Error types will be filled in Task 2

crates/idfoto-core/src/lib.rs

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+pub mod error;