fix(pusher): improve welist response logging, error handling, and add request timeout

- Always log HTTP status code and response body from welist (info level)
- Log send_stats_report errors at call site instead of silently discarding
- Add 10s timeout to reqwest client to prevent indefinite hangs
- Apply clippy fixes (is_empty, if-let chains, dead_code, etc.)

src/db.rs

@@ -178,8 +178,8 @@ pub fn create_database(db: &Connection) {
     }
 }
 */
-pub fn insert_xpub(db: &Connection, network: &String, xpub: &String) {
-    if xpub != "" {
+pub fn insert_xpub(db: &Connection, network: &str, xpub: &str) {
+    if !xpub.is_empty() {
         trace!("going to insert: {} xpub:{}", network, xpub);
         let mut stmt = match db.prepare("INSERT INTO tbl_xpub(network,xpub) VALUES(?, ?);") {
             Ok(s) => s,