fix(api): flatten apps/api dist build output

.github/workflows/ci.yml

@@ -24,6 +24,10 @@ jobs:
       # The Vercel serverless functions in api/ live outside the pnpm workspace,
       # so turbo doesn't cover them — typecheck them explicitly.
       - run: pnpm typecheck:api
+      - name: Verify apps/api build output is flat
+        run: |
+          pnpm --filter @meridian/api build
+          test -f apps/api/dist/index.js
 
   test:
     name: Test

apps/api/tsconfig.json

@@ -3,15 +3,9 @@
   "compilerOptions": {
     "lib": ["ES2020"],
     "ignoreDeprecations": "6.0",
-    "baseUrl": ".",
-    "rootDir": "../..",
-    "outDir": "dist",
-    "paths": {
-      "@meridian/shared": ["../../packages/shared/src"],
-      "@meridian/stellar-sdk-helpers": [
-        "../../packages/stellar-sdk-helpers/src"
-      ]
-    }
+    "rootDir": "src",
+    "outDir": "dist"
   },
-  "include": ["src"]
+  "include": ["src"],
+  "exclude": ["src/**/*.test.ts"]
 }