fix(docker): use explicit tsconfig in api build command

tsc without --project flag picks up tsconfig.json from the workspace
root, which lacks the packages/* paths needed for the monorepo build.
Explicit --project . ensures tsc uses the local tsconfig.json.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "tsx watch src/index.ts",
-    "build": "tsc",
+    "build": "tsc --project .",
     "start": "node dist/index.js",
     "lint": "eslint src --ext .ts",
     "typecheck": "tsc --noEmit",