feat: add file storage service and update configurations

refactor: migrate to tsup for builds and update tsconfigs
fix: update error handling and validation in payment service
chore: update package scripts and dependencies
docs: update README and env examples

apps/api/tsup.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from "tsup";
+
+export default defineConfig({
+  entry: ["src/index.ts"],
+  format: ["esm"],
+  dts: false,
+  splitting: false,
+  sourcemap: true,
+  clean: true,
+  external: ["@repo/config", "@repo/logger", "@repo/typescript-config"],
+  treeshake: true,
+  minify: false,
+  target: "node18",
+  platform: "node",
+});