fix: use tls-rustls for musl builds; fix clippy collapsible-if

- Switch sqlx from tls-native-tls to tls-rustls to avoid OpenSSL
  pkg-config cross-compilation issues on x86_64-unknown-linux-musl
- Collapse nested if-let in search.rs to satisfy clippy::collapsible-if

Made-with: Cursor

Cargo.toml

@@ -10,7 +10,7 @@ clap = { version = "4.6.0", features = ["derive", "env"] }
 dotenvy = "0.15.7"
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
-sqlx = { version = "0.8.6", features = ["runtime-tokio", "tls-native-tls", "postgres", "uuid", "json", "chrono"] }
+sqlx = { version = "0.8.6", features = ["runtime-tokio", "tls-rustls", "postgres", "uuid", "json", "chrono"] }
 tokio = { version = "1.50.0", features = ["full"] }
 toml = "1.0.7"
 uuid = { version = "1.22.0", features = ["serde", "v4"] }