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/package.json

@@ -2,10 +2,13 @@
   "name": "api",
   "version": "0.0.0",
   "private": true,
+  "type": "module",
   "scripts": {
-    "dev": "NODE_PATH=./src tsnd --respawn --transpile-only --exit-child src/index.ts",
-    "build": "tsc",
-    "start": "NODE_PATH=./dist node ./dist/index.js"
+    "dev": "tsx watch src/index.ts",
+    "build": "tsup",
+    "start": "node dist/index.js",
+    "check-types": "tsc --noEmit",
+    "clean": "rm -rf dist"
   },
   "dependencies": {
     "@hono/node-server": "^1.15.0",
@@ -22,7 +25,9 @@
     "zod-openapi": "^4.2.4"
   },
   "devDependencies": {
-    "ts-node-dev": "^2.0.0",
-    "typescript": "latest"
+    "@types/node": "^22.10.2",
+    "tsup": "^8.3.5",
+    "tsx": "^4.19.2",
+    "typescript": "^5.8.3"
   }
 }