fix: silence sqlcipher logs except for ERROR level

Set default SQLCipher cipher_log_level to ERROR so only error-level
messages are emitted. The SQLCIPHER_LOG=true env var still overrides
to INFO for debugging purposes.

Resolves #3257

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: xmtp-coder-agent

crates/xmtp_db/src/encrypted_store/database/native/sqlcipher_connection.rs

@@ -301,6 +301,9 @@ impl super::ValidatedConnection for EncryptedConnection {
         if is_sqlcipher_log_enabled {
             conn.batch_execute("PRAGMA cipher_log = stderr; PRAGMA cipher_log_level = INFO;")
                 .ok();
+        } else {
+            conn.batch_execute("PRAGMA cipher_log = stderr; PRAGMA cipher_log_level = ERROR;")
+                .ok();
         }
         tracing::debug!("SQLCipher Database validated.");
         Ok(())