Update dependencies and fix gitignore

This commit updates various dependencies to their latest versions,
ensuring better compatibility and security. It also corrects the
`.gitignore` file to properly exclude the `target/` directory instead of
`server/target/`.

Cargo.toml

@@ -0,0 +1,17 @@
+[workspace]
+members = ["server"]
+resolver = "3"
+
+[workspace.package]
+edition = "2024"
+version = "0.1.0"
+
+[workspace.dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+uuid = { version = "1", features = ["v4", "serde"] }
+time = { version = "0.3.47", features = ["local-offset", "parsing", "formatting", "macros"] }
+tokio = { version = "1", features = ["full"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "multipart", "rustls-tls"] }
+tracing = "0.1"
+toml = "0.8"