Add backend

backend/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "backend"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0"
+axum = "0.7"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite", "macros"] }
+tokio = { version = "1.36", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+nostr-sdk = "0.39"
+uuid = { version = "1.7", features = ["v4"] }
+chrono = { version = "0.4", features = ["serde"] }
+tower-http = { version = "0.5", features = ["cors"] }