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

src/commands/search.rs

@@ -73,14 +73,11 @@ pub async fn run(
             println!("  tags:     [{}]", row.tags.join(", "));
         }
 
-        let meta_obj = row.metadata.as_object();
-        if let Some(m) = meta_obj {
-            if !m.is_empty() {
-                println!(
-                    "  metadata: {}",
-                    serde_json::to_string_pretty(&row.metadata)?
-                );
-            }
+        if row.metadata.as_object().is_some_and(|m| !m.is_empty()) {
+            println!(
+                "  metadata: {}",
+                serde_json::to_string_pretty(&row.metadata)?
+            );
         }
 
         if show_secrets {