feat: set up monorepo scaffold with Yarn workspaces, Django API, React/Vite web, and Docker Compose

- Root package.json with Yarn workspaces (web, api)
- /web: React 19 + Vite 6 + @vitejs/plugin-react
  - index.html, src/main.jsx, src/App.jsx, vite.config.js
- /api: Django 5.x managed with uv
  - pyproject.toml with Django + psycopg2-binary
  - project/settings.py with PostgreSQL config from DATABASE_URL
  - project/urls.py, project/wsgi.py, manage.py
- docker-compose.yml with db (postgres:15), api, web services
  - Health check for db, live code volumes, dependency ordering
- Dockerfiles for both web (node:20-alpine) and api (python:3.12-slim)
- .gitignore updated for Python build artifacts and venv
- docs/implementation-issue-1-monorepo-scaffold.md

docker-compose.yml

@@ -0,0 +1,51 @@
+version: "3.9"
+
+services:
+  db:
+    image: postgres:15
+    restart: unless-stopped
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: jobtracker
+      POSTGRES_USER: jobtracker
+      POSTGRES_PASSWORD: jobtracker
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U jobtracker -d jobtracker"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  api:
+    build:
+      context: ./api
+    ports:
+      - "8000:8000"
+    environment:
+      DATABASE_URL: "postgres://jobtracker:jobtracker@db:5432/jobtracker"
+    volumes:
+      - ./api:/app
+    command: >
+      sh -c "python manage.py migrate && python manage.py runserver 0.0.0.0:8000"
+    depends_on:
+      db:
+        condition: service_healthy
+
+  web:
+    build:
+      context: ./web
+    ports:
+      - "3000:3000"
+    environment:
+      REACT_APP_API_URL: "http://localhost:8000"
+    volumes:
+      - ./web:/app
+      - /app/node_modules
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  postgres_data: