feat: scaffold centralized Spring Boot backend project

backend/src/main/java/com/rit/portal/PortalApplication.java

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

backend/src/main/java/com/rit/portal/config/WebConfig.java

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+package com.rit.portal.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")
+                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
+                .allowedHeaders("*")
+                .allowCredentials(true);
+    }
+}

backend/src/main/resources/application.properties

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+# ─── DATABASE CONNECTION CONFIGURATION ───
+spring.datasource.url=jdbc:postgresql://localhost:5432/rit_freshers_hub?sslmode=disable
+spring.datasource.username=postgres
+spring.datasource.password=your_local_postgres_password_here
+
+# ─── JPA / HIBERNATE SETTINGS ───
+spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
+spring.jpa.hibernate.ddl-auto=validate
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+
+# ─── SERVER PORT ───
+server.port=8080