fix(ci): gitignore was excluding src/frontend/src/data/defaults.ts

The .gitignore had 'data/' which matches any 'data' directory at
any depth. That excluded src/frontend/src/data/ from git, so the
file defaults.ts (with DEFAULT_INSUMOS, DEFAULT_FORMULAS, etc.)
was never committed. CI was failing with TS2307 because the file
was in the local working tree but not in the git checkout.

Tighten the rule to '/data/' so only the root runtime H2 database
folder is ignored, not the source data directory.

.gitignore

@@ -6,7 +6,7 @@ src/frontend/node_modules/
 src/frontend/dist/
 src/frontend/tsconfig.app.tsbuildinfo
 src/frontend/tsconfig.node.tsbuildinfo
-data/
+/data/
 .idea/
 .vscode/
 *.iml