feat: Add initial frontend dependencies, base CSS, and Gitea Docker build workflow.

docker-compose.yml

@@ -0,0 +1,43 @@
+version: '3.8'
+
+services:
+  db:
+    image: postgres:15
+    container_name: todo-db
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: tododb
+    ports:
+      - "5433:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: [ "CMD-SHELL", "pg_isready -U postgres" ]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  backend:
+    build: ./backend
+    container_name: todo-backend
+    ports:
+      - "8082:8080"
+    environment:
+      - SPRING_DATASOURCE_URL=jdbc:postgresql://db:5433/tododb
+      - SPRING_DATASOURCE_USERNAME=postgres
+      - SPRING_DATASOURCE_PASSWORD=postgres
+    depends_on:
+      db:
+        condition: service_healthy
+
+  frontend:
+    build: ./frontend
+    container_name: todo-frontend
+    ports:
+      - "5173:80"
+    depends_on:
+      - backend
+
+volumes:
+  postgres_data: