* fix(mysql): health-check pooled connection before DDL query
`mysql_ddl` fetched a connection with a raw `pool.get_conn()` and issued
`SHOW CREATE TABLE` directly, unlike other read paths (`get_columns`,
`list_indexes`, ...) which go through `get_conn_with_health_check`. A
pooled connection that went stale while idle (server closed it after its
idle timeout, NAT/firewall dropped the TCP state, ...) would then fail on
the first DDL request after a period of inactivity, surfacing a low-level
connection error that a manual refresh would mask.
Route `mysql_ddl` through `get_conn_with_health_check` so stale
connections are pinged and replaced before the query runs, matching the
rest of the MySQL metadata path.
* fix(test): add redis_scan_page_size to ConnectionConfig test helpers
`d815a16b` (feat(redis): move scan page size to connections) added
`redis_scan_page_size` to `ConnectionConfig` but did not update several
struct-literal test helpers, so `cargo clippy --workspace --all-targets`
fails with `missing field redis_scan_page_size`. This is a pre-existing
breakage on `main` (CI has been red since that commit) and is unrelated to
this PR's actual change; included here only to unblock CI.
Helpers fixed here:
- src-tauri/src/commands/connection.rs (`mongodb_config`)
- crates/dbx-web/src/routes/connection.rs (`sqlite_config`)
jischeng
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