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

backend/src/main/java/com/todo/backend/BackendApplication.java

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+package com.todo.backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BackendApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BackendApplication.class, args);
+	}
+
+}

backend/src/main/java/com/todo/backend/config/WebConfig.java

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+package com.todo.backend.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/api/**")
+                .allowedOrigins("http://localhost:5173", "http://localhost:3000", "http://localhost:8081", "http://localhost:80") // Typical Vite/React/Docker ports
+                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
+                .allowedHeaders("*")
+                .allowCredentials(true);
+    }
+}

backend/src/main/java/com/todo/backend/controller/TodoController.java

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+package com.todo.backend.controller;
+
+import com.todo.backend.model.Todo;
+import com.todo.backend.service.TodoService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Optional;
+
+@RestController
+@RequestMapping("/api/todos")
+public class TodoController {
+
+    private final TodoService todoService;
+
+    @Autowired
+    public TodoController(TodoService todoService) {
+        this.todoService = todoService;
+    }
+
+    @GetMapping
+    public ResponseEntity<List<Todo>> getAllTodos() {
+        return new ResponseEntity<>(todoService.getAllTodos(), HttpStatus.OK);
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<Todo> getTodoById(@PathVariable Long id) {
+        Optional<Todo> todo = todoService.getTodoById(id);
+        return todo.map(value -> new ResponseEntity<>(value, HttpStatus.OK))
+                .orElseGet(() -> new ResponseEntity<>(HttpStatus.NOT_FOUND));
+    }
+
+    @PostMapping
+    public ResponseEntity<Todo> createTodo(@RequestBody Todo todo) {
+        Todo createdTodo = todoService.createTodo(todo);
+        return new ResponseEntity<>(createdTodo, HttpStatus.CREATED);
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<Todo> updateTodo(@PathVariable Long id, @RequestBody Todo todo) {
+        Todo updatedTodo = todoService.updateTodo(id, todo);
+        if (updatedTodo != null) {
+            return new ResponseEntity<>(updatedTodo, HttpStatus.OK);
+        }
+        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteTodo(@PathVariable Long id) {
+        if (todoService.deleteTodo(id)) {
+            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+        }
+        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+    }
+}

backend/src/main/java/com/todo/backend/model/Todo.java

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+package com.todo.backend.model;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "todos")
+public class Todo {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private String title;
+
+    @Column(length = 1000)
+    private String description;
+
+    @Column(nullable = false)
+    private boolean completed = false;
+
+    // Default constructor is required by JPA
+    public Todo() {
+    }
+
+    public Todo(String title, String description, boolean completed) {
+        this.title = title;
+        this.description = description;
+        this.completed = completed;
+    }
+
+    // Getters and Setters
+    public Long getId() {
+        return id;
+    }
+    
+    // no setId as it's auto-generated, though sometimes needed for mapping
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public boolean isCompleted() {
+        return completed;
+    }
+
+    public void setCompleted(boolean completed) {
+        this.completed = completed;
+    }
+}

backend/src/main/java/com/todo/backend/repository/TodoRepository.java

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+package com.todo.backend.repository;
+
+import com.todo.backend.model.Todo;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface TodoRepository extends JpaRepository<Todo, Long> {
+}

backend/src/main/java/com/todo/backend/service/TodoService.java

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+package com.todo.backend.service;
+
+import com.todo.backend.model.Todo;
+import com.todo.backend.repository.TodoRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class TodoService {
+
+    private final TodoRepository todoRepository;
+
+    @Autowired
+    public TodoService(TodoRepository todoRepository) {
+        this.todoRepository = todoRepository;
+    }
+
+    public List<Todo> getAllTodos() {
+        return todoRepository.findAll();
+    }
+
+    public Optional<Todo> getTodoById(Long id) {
+        return todoRepository.findById(id);
+    }
+
+    public Todo createTodo(Todo todo) {
+        return todoRepository.save(todo);
+    }
+
+    public Todo updateTodo(Long id, Todo todoDetails) {
+        Optional<Todo> optionalTodo = todoRepository.findById(id);
+        
+        if (optionalTodo.isPresent()) {
+            Todo existingTodo = optionalTodo.get();
+            existingTodo.setTitle(todoDetails.getTitle());
+            existingTodo.setDescription(todoDetails.getDescription());
+            existingTodo.setCompleted(todoDetails.isCompleted());
+            return todoRepository.save(existingTodo);
+        }
+        
+        return null;
+    }
+
+    public boolean deleteTodo(Long id) {
+        if (todoRepository.existsById(id)) {
+            todoRepository.deleteById(id);
+            return true;
+        }
+        return false;
+    }
+}

backend/src/main/resources/application.properties

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+spring.application.name=backend
+spring.datasource.url=jdbc:postgresql://localhost:5432/tododb
+spring.datasource.username=postgres
+spring.datasource.password=postgres
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect