chore(Dockerfile): set working directory to /app for better organization

feat(Dockerfile): include tsconfig.json in the Docker image for TypeScript support

Dockerfile

@@ -1,7 +1,9 @@
 FROM oven/bun:latest as base
 
+WORKDIR /app
+
 # Copy the lock and package file
-COPY bun.lockb package.json ./
+COPY bun.lockb package.json tsconfig.json ./
 
 # Copy source code
 COPY src ./src