Migrate stack to SQLite and set Coolify defaults

drizzle.config.ts

@@ -1,13 +1,9 @@
-const databaseUrl = process.env.DATABASE_URL?.trim();
-
-if (!databaseUrl) {
-  throw new Error('DATABASE_URL is required to run Drizzle migrations.');
-}
+const databaseUrl = process.env.DATABASE_URL?.trim() || 'file:data/fiscal.sqlite';
 
 export default {
   schema: './lib/server/db/schema.ts',
   out: './drizzle',
-  dialect: 'postgresql',
+  dialect: 'sqlite',
   dbCredentials: {
     url: databaseUrl
   },