fix: use tsc directly instead of nest build to resolve path aliases

- Changed build script from `nest build` to `tsc -p tsconfig.build.json`
- This ensures TypeScript path aliases (@domain/*, @application/*, @infrastructure/*) are properly resolved during compilation
- tsc-alias then converts the resolved paths to relative imports in the output
- Reverted tsconfig.json to original baseUrl: "./" configuration
- Added explicit path aliases to tsconfig.build.json for clarity

Root cause: NestJS's `nest build` command doesn't fully support TypeScript path aliases out of the box. Using `tsc` directly ensures proper path resolution.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/backend/nest-cli.json

@@ -6,6 +6,8 @@
     "deleteOutDir": true,
     "webpack": false,
     "tsConfigPath": "tsconfig.build.json",
-    "plugins": ["@nestjs/swagger"]
+    "plugins": ["@nestjs/swagger"],
+    "assets": [],
+    "watchAssets": false
   }
 }

apps/backend/package.json

@@ -4,7 +4,8 @@
   "description": "Xpeditis Backend API - Maritime Freight Booking Platform",
   "private": true,
   "scripts": {
-    "build": "nest build && tsc-alias",
+    "build": "tsc -p tsconfig.build.json && tsc-alias -p tsconfig.build.json",
+    "build:nest": "nest build && tsc-alias",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "start": "nest start",
     "dev": "nest start --watch",

apps/backend/tsconfig.build.json

@@ -1,4 +1,12 @@
 {
   "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "baseUrl": "./",
+    "paths": {
+      "@domain/*": ["src/domain/*"],
+      "@application/*": ["src/application/*"],
+      "@infrastructure/*": ["src/infrastructure/*"]
+    }
+  },
   "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
 }

apps/backend/tsconfig.json

@@ -9,7 +9,7 @@
     "target": "ES2021",
     "sourceMap": true,
     "outDir": "./dist",
-    "baseUrl": "./src",
+    "baseUrl": "./",
     "incremental": true,
     "skipLibCheck": true,
     "strictNullChecks": true,
@@ -23,9 +23,9 @@
     "resolveJsonModule": true,
     "esModuleInterop": true,
     "paths": {
-      "@domain/*": ["domain/*"],
-      "@application/*": ["application/*"],
-      "@infrastructure/*": ["infrastructure/*"]
+      "@domain/*": ["src/domain/*"],
+      "@application/*": ["src/application/*"],
+      "@infrastructure/*": ["src/infrastructure/*"]
     }
   },
   "include": ["src/**/*"],