refactor: rewrite project from Rust to Go

- Replace Axum with Chi router
- Replace sqlx with pgx for PostgreSQL
- Replace tonic/prost with grpc-go
- Replace tracing with zerolog
- Update flake.nix for Go build with protoc generation
- Preserve all existing endpoints and functionality

Stack: Chi, pgx, grpc-go, zerolog, yaml.v3

Cargo.toml

@@ -1,37 +0,0 @@
-[package]
-name = "music-agregator"
-version = "0.1.0"
-edition = "2021"
-
-[[bin]]
-name = "music-agregator"
-path = "src/main.rs"
-
-[dependencies]
-axum = "0.8"
-tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-serde_yaml = "0.9"
-tower-http = { version = "0.6", features = ["cors", "trace"] }
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-uuid = { version = "1", features = ["v4", "serde"] }
-reqwest = { version = "0.12", default-features = false, features = ["json", "cookies", "rustls-tls", "multipart"] }
-async-trait = "0.1"
-thiserror = "2"
-url = "2"
-roxmltree = "0.20"
-base64 = "0.22"
-chrono = { version = "0.4", features = ["serde"] }
-clap = { version = "4", features = ["derive"] }
-sqlx = { version = "0.8", features = ["runtime-tokio", "postgres", "uuid", "chrono", "json"] }
-tonic = "0.12"
-prost = "0.13"
-
-[build-dependencies]
-tonic-build = "0.12"
-
-[profile.release]
-opt-level = 3
-lto = true