fix: update environment variable usage in scripts and enhance CSS theming

apps/api/package.json

@@ -4,8 +4,8 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "bun --watch src/index.ts",
-    "start": "bun src/index.ts",
+    "dev": "bun --env-file=../../.env --watch src/index.ts",
+    "start": "bun --env-file=../../.env src/index.ts",
     "typecheck": "tsc --project tsconfig.json",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate"