refactor: migrate from ESLint to Biome and extract SQL queries to data.ts

- Replace ESLint with Biome for linting and formatting
- Configure Biome with tabs, double quotes, and organized imports
- Move all SQL/Drizzle queries from page.tsx files to data.ts files
- Create new data.ts files for: ajustes, dashboard, relatorios/categorias
- Update existing data.ts files: extrato, fatura (add lancamentos queries)
- Remove all drizzle-orm imports from page.tsx files
- Update README.md with new tooling info

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

components/month-picker/return-button.tsx

@@ -4,22 +4,22 @@ import React from "react";
 import { Button } from "../ui/button";
 
 interface ReturnButtonProps {
-  disabled?: boolean;
-  onClick: () => void;
+	disabled?: boolean;
+	onClick: () => void;
 }
 
 const ReturnButton = React.memo(({ disabled, onClick }: ReturnButtonProps) => {
-  return (
-    <Button
-      className="w-28 h-6 rounded-sm"
-      size="sm"
-      disabled={disabled}
-      onClick={onClick}
-      aria-label="Retornar para o mês atual"
-    >
-      Mês Atual
-    </Button>
-  );
+	return (
+		<Button
+			className="w-28 h-6 rounded-sm"
+			size="sm"
+			disabled={disabled}
+			onClick={onClick}
+			aria-label="Retornar para o mês atual"
+		>
+			Mês Atual
+		</Button>
+	);
 });
 
 ReturnButton.displayName = "ReturnButton";