Chat2DB

Chat2DB Community 5.3.8 reads, copies and exports complete large values instead of truncated previews - including for views, aggregations and tables without a primary key - adds the SQLX command line integration to Settings, and fixes table browsing and the KingbaseES procedure list.

## Added (1)

1. **SQLX command line integration**: install, update and locate the OtterMind SQLX CLI from Settings, import the connections Chat2DB already stores, and see the Skill command an agent needs; credentials go to the child process on stdin and are never written to disk, the renderer or the logs. by @openai0229 in #2959

## Optimization (1)

1. **Complete large values for view, copy and export**: JSON / LONGTEXT / BLOB values are completed from a snapshot captured while the query runs, so the grid, every copy format (cell, selection, `INSERT` / `UPDATE` / `WHERE`, IN Values, TSV, Markdown) and exports return the full content even when there is no primary key to re-query; the captured content is freed when the result is discarded or when it expires. by @openai0229 in #2972

## Fixed (2)

1. **KingbaseES procedure list**: procedures come from `sys_catalog.sys_proc` instead of the JDBC driver q