Add unit tests for models and services

- Implemented unit tests for the Package model, covering methods such as generateId, findById, findByName, and version management.
- Created unit tests for the Repository model, including repository creation, name validation, and retrieval methods.
- Added tests for the Session model, focusing on session creation, validation, and invalidation.
- Developed unit tests for the User model, ensuring user creation, password hashing, and retrieval methods function correctly.
- Implemented AuthService tests, validating login, token refresh, and session management.
- Added TokenService tests, covering token creation, validation, and revocation processes.

test/fixtures/cargo/demo-crate/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "demo-crate"
+version = "1.0.0"
+edition = "2021"
+authors = ["Stack.Gallery Test <test@stack.gallery>"]
+description = "Demo crate for Stack.Gallery Registry e2e tests"
+license = "MIT"
+repository = "https://github.com/stack-gallery/demo-crate"
+readme = "README.md"
+keywords = ["demo", "test", "stack-gallery"]
+categories = ["development-tools"]
+
+[lib]
+name = "demo_crate"
+path = "src/lib.rs"

test/fixtures/cargo/demo-crate/README.md

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+# demo-crate
+
+Demo crate for Stack.Gallery Registry e2e tests.
+
+## Usage
+
+```rust
+use demo_crate::greet;
+
+fn main() {
+    println!("{}", greet("World")); // Hello, World!
+}
+```

test/fixtures/cargo/demo-crate/src/lib.rs

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+//! Demo crate for Stack.Gallery Registry e2e tests
+
+/// Greets the given name
+pub fn greet(name: &str) -> String {
+    format!("Hello, {}!", name)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_greet() {
+        assert_eq!(greet("World"), "Hello, World!");
+    }
+}