sciagent code + Gitea Actions CI/CD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend_investigator/vitest.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vitest/config';
+
+// Pure-logic unit tests for the data-import domain layer (features/data-import/domain/**).
+// `node` env is enough — the domain is framework-free and uses only Web globals (no DOM,
+// no React, no axios). Mirrors shared/vitest.config.ts so `npm test -w frontend_investigator`
+// behaves like the rest of the monorepo.
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['src/**/*.test.ts'],
+  },
+});