[Fix-18446][task-sql]Persist sqlSource and sqlResource fields when saving SQL task node

[nanxiuzi]

Summary

Fixes #18446

The SQL task node's "Resource File" mode (introduced in #18019) loses its sqlSource and sqlResource values after saving — the node reverts to "Script" mode and the selected SQL file path is empty on reopen. The two form fields are defined in use-sql.ts (lines ~65 and ~95) but are never written to taskParams by formatParams() in format-data.ts, so they are dropped on save.

Changes

• dolphinscheduler-ui/src/views/projects/task/components/node/format-data.ts: serialize sqlSource and sqlResource into taskParams in the SQL branch of formatParams().
• dolphinscheduler-ui/src/views/projects/task/components/node/types.ts: declare sqlSource?: string and sqlResource?: string on ITaskParams. Required because strict: true is set in tsconfig.json — otherwise vue-tsc --noEmit (part of pnpm run build:prod) fails the type check on data.sqlSource and taskParams.sqlSource.

Backfill works automatically — formatModel() already does ...omit(data.taskParams, ['resourceList', 'mainJar', 'localParams']), so any field written into taskParams is transparently restored on edit. No backfill-side change needed.

Verification

• pnpm run build:prod passes (vue-tsc type check + Vite production build).
• Manual test on a 3.4.2 deployment: SQL node configured with "Resource File" mode + a selected SQL file → save → reopen → both sqlSource and sqlResource preserved. DevTools Network confirms "sqlSource":"FILE" and "sqlResource":"..." in taskDefinitionJson.taskParams.

Reproduce steps (for reviewers)

1. Open a workflow definition for editing.
2. Add a SQL task node.
3. Set "SQL Source" to "File".
4. Pick a .sql resource file from the resource tree.
5. Save the node and the workflow definition.
6. Reopen the SQL task node — without this PR, "SQL Source" has reverted to "Script" and the resource path is empty; with this PR, both are preserved.