added start backend

src/main/java/com/krylov/refound/ReFoundApplication.java

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

src/main/java/com/krylov/refound/config/SecurityConfig.java

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+package com.krylov.refound.config;
+
+public class SecurityConfig {
+}

src/main/java/com/krylov/refound/controller/AuthController.java

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+package com.krylov.refound.controller;
+
+public class AuthController {
+}

src/main/java/com/krylov/refound/controller/PostController.java

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+package com.krylov.refound.controller;
+
+public class PostController {
+}

src/main/java/com/krylov/refound/dto/AuthRequest.java

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+package com.krylov.refound.dto;
+
+public class AuthRequest {
+}

src/main/java/com/krylov/refound/dto/AuthResponse.java

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+package com.krylov.refound.dto;
+
+public class AuthResponse {
+}

src/main/java/com/krylov/refound/dto/PostRequest.java

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+package com.krylov.refound.dto;
+
+public class PostRequest {
+}

src/main/java/com/krylov/refound/dto/PostResponse.java

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+package com.krylov.refound.dto;
+
+public class PostResponse {
+}

src/main/java/com/krylov/refound/entity/Image.java

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+package com.krylov.refound.entity;
+
+public class Image {
+}

src/main/java/com/krylov/refound/entity/Post.java

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+package com.krylov.refound.entity;
+
+public class Post {
+}

src/main/java/com/krylov/refound/entity/User.java

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+package com.krylov.refound.entity;
+
+public class User {
+}

src/main/java/com/krylov/refound/enums/ErrorCode.java

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+package com.krylov.refound.enums;
+
+public enum ErrorCode {
+}

src/main/java/com/krylov/refound/enums/PostStatus.java

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+package com.krylov.refound.enums;
+
+public enum PostStatus {
+}

src/main/java/com/krylov/refound/enums/PostType.java

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+package com.krylov.refound.enums;
+
+public enum PostType {
+}

src/main/java/com/krylov/refound/exception/ApiException.java

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+package com.krylov.refound.exception;
+
+public class ApiException {
+}

src/main/java/com/krylov/refound/exception/ErrorResponse.java

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+package com.krylov.refound.exception;
+
+public class ErrorResponse {
+}

src/main/java/com/krylov/refound/exception/GlobalExceptionHandler.java

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+package com.krylov.refound.exception;
+
+public class GlobalExceptionHandler {
+}

src/main/java/com/krylov/refound/mapper/PostMapper.java

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+package com.krylov.refound.mapper;
+
+public class PostMapper {
+}

src/main/java/com/krylov/refound/repository/PostRepository.java

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+package com.krylov.refound.repository;
+
+public interface PostRepository {
+}

src/main/java/com/krylov/refound/repository/UserRepository.java

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+package com.krylov.refound.repository;
+
+public interface UserRepository {
+}

src/main/java/com/krylov/refound/service/PostService.java

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+package com.krylov.refound.service;
+
+public class PostService {
+}

src/main/java/com/krylov/refound/service/UserService.java

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+package com.krylov.refound.service;
+
+public class UserService {
+}

src/main/java/com/krylov/refound/service/security/AuthService.java

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+package com.krylov.refound.service;
+
+import com.krylov.refound.dto.AuthRequest;
+import com.krylov.refound.dto.AuthResponse;
+import com.krylov.refound.entity.User;
+import com.krylov.refound.enums.ErrorCode;
+import com.krylov.refound.exception.ApiException;
+import com.krylov.refound.repository.UserRepository;
+import java.time.LocalDateTime;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class AuthService {
+  private final UserRepository repository;
+  private final PasswordEncoder passwordEncoder;
+  private final JwtService jwtService;
+
+  public AuthResponse register(AuthRequest request) {
+
+    if (repository.findByEmail(request.getEmail()).isPresent()) {
+      throw new ApiException(ErrorCode.BAD_REQUEST, "Email already exists", HttpStatus.BAD_REQUEST);
+    }
+
+    User user = new User();
+    user.setEmail(request.getEmail());
+    user.setPassword(passwordEncoder.encode(request.getPassword()));
+    user.setCreatedAt(LocalDateTime.now());
+
+    repository.save(user);
+
+    String token = jwtService.generateToken(user.getEmail());
+    return new AuthResponse(token);
+  }
+
+  public AuthResponse login(AuthRequest request) {
+
+    User user = repository.findByEmail(request.getEmail())
+        .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND, "User not found", HttpStatus.NOT_FOUND));
+
+    if (!passwordEncoder.matches(request.getPassword(), user.getPassword())) {
+      throw new ApiException(ErrorCode.BAD_REQUEST, "Invalid password", HttpStatus.BAD_REQUEST);
+    }
+
+    String token = jwtService.generateToken(user.getEmail());
+    return new AuthResponse(token);
+  }
+}

src/main/java/com/krylov/refound/service/security/CustomUserDetailsService.java

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+package com.krylov.refound.service;
+
+import com.krylov.refound.entity.User;
+import com.krylov.refound.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class CustomUserDetailsService  implements UserDetailsService {
+  private final UserRepository repository;
+
+  @Override
+  public UserDetails loadUserByUsername(String email) {
+    User user = repository.findByEmail(email)
+        .orElseThrow(() -> new UsernameNotFoundException("User not found"));
+
+    return org.springframework.security.core.userdetails.User
+        .withUsername(user.getEmail())
+        .password(user.getPassword())
+        .authorities("USER")
+        .build();
+  }
+}

src/main/java/com/krylov/refound/service/security/JwtFilter.java

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+package com.krylov.refound.service;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+@Component
+@RequiredArgsConstructor
+public class JwtFilter extends OncePerRequestFilter {
+
+  private final JwtService jwtService;
+  private final CustomUserDetailsService userDetailsService;
+
+  @Override
+  protected void doFilterInternal(
+      HttpServletRequest request,
+      HttpServletResponse response,
+      FilterChain filterChain
+  ) throws ServletException, IOException {
+
+    String header = request.getHeader("Authorization");
+
+    if (header == null || !header.startsWith("Bearer ")) {
+      filterChain.doFilter(request, response);
+      return;
+    }
+
+    String token = header.substring(7);
+    String email = jwtService.extractEmail(token);
+
+    if (email != null && SecurityContextHolder.getContext().getAuthentication() == null) {
+
+      UserDetails userDetails = userDetailsService.loadUserByUsername(email);
+
+      UsernamePasswordAuthenticationToken auth =
+          new UsernamePasswordAuthenticationToken(
+              userDetails,
+              null,
+              userDetails.getAuthorities()
+          );
+
+      SecurityContextHolder.getContext().setAuthentication(auth);
+    }
+
+    filterChain.doFilter(request, response);
+  }
+}

src/main/java/com/krylov/refound/service/security/JwtService.java

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+package com.krylov.refound.service;
+
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.security.Keys;
+import java.util.Date;
+import org.springframework.stereotype.Service;
+
+@Service
+public class JwtService {
+  private final String SECRET = "very_secret_key_123";
+
+  public String generateToken(String email) {
+    return Jwts.builder()
+        .setSubject(email)
+        .setIssuedAt(new Date())
+        .setExpiration(new Date(System.currentTimeMillis() + 86400000)) // 1 день
+        .signWith(Keys.hmacShaKeyFor(SECRET.getBytes()))
+        .compact();
+  }
+
+  public String extractEmail(String token) {
+    return Jwts.parserBuilder()
+        .setSigningKey(SECRET.getBytes())
+        .build()
+        .parseClaimsJws(token)
+        .getBody()
+        .getSubject();
+  }
+}

src/main/java/com/krylov/refound/util/SecurityUtils.java

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+package com.krylov.refound.util;
+
+public class SecurityUtils {
+}

src/main/resources/application.properties

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+spring.application.name=ReFound