fix: override test-related types in tsconfig.build.json for Docker builds

- Override the 'types' array to only include 'node' types
- Exclude 'types' directory and any nested types directories from build
- Add comment explaining the types override rationale
- This prevents TypeScript from looking for vitest/globals and test-env types

The issue was that tsconfig.build.json was inheriting test-related type
definitions from tsconfig.json which aren't available in the minimal
Docker build environment.

Code reviewed and enhanced based on suggestions:
- Added '**/types' to exclude pattern for comprehensive exclusion
- Added explanatory comment for future maintainers

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

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

tsconfig.build.json

@@ -1,8 +1,10 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
-    "rootDir": "./src"
+    "rootDir": "./src",
+    // Override parent's types to exclude test-related types for production builds
+    "types": ["node"]
   },
   "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts", "tests"]
+  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts", "tests", "types", "**/types"]
 }