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>

drizzle.config.ts

@@ -1,10 +1,10 @@
 import type { Config } from "drizzle-kit";
 
 export default {
-  schema: "./db/schema.ts",
-  out: "./drizzle",
-  dialect: "postgresql",
-  dbCredentials: {
-    url: process.env.DATABASE_URL!,
-  },
+	schema: "./db/schema.ts",
+	out: "./drizzle",
+	dialect: "postgresql",
+	dbCredentials: {
+		url: process.env.DATABASE_URL!,
+	},
 } satisfies Config;