Initialize Spring Boot backend with JWT auth

src/main/java/com/openisle/controller/AuthController.java

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+package com.openisle.controller;
+
+import com.openisle.model.User;
+import com.openisle.service.EmailService;
+import com.openisle.service.JwtService;
+import com.openisle.service.UserService;
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/auth")
+@RequiredArgsConstructor
+public class AuthController {
+    private final UserService userService;
+    private final JwtService jwtService;
+    private final EmailService emailService;
+
+    @PostMapping("/register")
+    public ResponseEntity<?> register(@RequestBody RegisterRequest req) {
+        User user = userService.register(req.getUsername(), req.getEmail(), req.getPassword());
+        emailService.sendEmail(user.getEmail(), "Welcome to OpenIsle", "Thank you for registering.");
+        String token = jwtService.generateToken(user.getUsername());
+        return ResponseEntity.ok(new JwtResponse(token));
+    }
+
+    @PostMapping("/login")
+    public ResponseEntity<?> login(@RequestBody LoginRequest req) {
+        return userService.authenticate(req.getUsername(), req.getPassword())
+                .map(user -> ResponseEntity.ok(new JwtResponse(jwtService.generateToken(user.getUsername()))))
+                .orElse(ResponseEntity.status(401).build());
+    }
+
+    @Data
+    private static class RegisterRequest {
+        private String username;
+        private String email;
+        private String password;
+    }
+
+    @Data
+    private static class LoginRequest {
+        private String username;
+        private String password;
+    }
+
+    @Data
+    private static class JwtResponse {
+        private final String token;
+    }
+}

src/main/java/com/openisle/controller/HelloController.java

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+package com.openisle.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HelloController {
+    @GetMapping("/api/hello")
+    public String hello() {
+        return "Hello, Authenticated User";
+    }
+}