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>

lib/auth/client.ts

@@ -3,7 +3,7 @@ import { createAuthClient } from "better-auth/react";
 const baseURL = process.env.BETTER_AUTH_URL?.replace(/\/$/, "");
 
 export const authClient = createAuthClient({
-  ...(baseURL ? { baseURL } : {}),
+	...(baseURL ? { baseURL } : {}),
 });
 
 /**