diff --git a/backend/src/main/java/com/xly/erp/common/config/CorsConfig.java b/backend/src/main/java/com/xly/erp/common/config/CorsConfig.java
new file mode 100644
index 0000000..bbdc177
--- /dev/null
+++ b/backend/src/main/java/com/xly/erp/common/config/CorsConfig.java
@@ -0,0 +1,31 @@
+package com.xly.erp.common.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+
+import java.util.List;
+
+@Configuration
+public class CorsConfig {
+
+    @Bean
+    public CorsConfigurationSource corsConfigurationSource() {
+        CorsConfiguration cfg = new CorsConfiguration();
+        cfg.setAllowedOrigins(List.of(
+                "http://localhost:5173",
+                "http://127.0.0.1:5173"
+        ));
+        cfg.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "OPTIONS"));
+        cfg.setAllowedHeaders(List.of("*"));
+        cfg.setExposedHeaders(List.of("Authorization"));
+        cfg.setAllowCredentials(true);
+        cfg.setMaxAge(3600L);
+
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/api/**", cfg);
+        return source;
+    }
+}
diff --git a/backend/src/main/java/com/xly/erp/common/security/SecurityConfig.java b/backend/src/main/java/com/xly/erp/common/security/SecurityConfig.java
index 02e9f31..3ba915d 100644
--- a/backend/src/main/java/com/xly/erp/common/security/SecurityConfig.java
+++ b/backend/src/main/java/com/xly/erp/common/security/SecurityConfig.java
@@ -4,6 +4,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
+import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.web.SecurityFilterChain;
@@ -24,8 +25,10 @@ public class SecurityConfig {
     @Bean
     SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
         http.csrf(csrf -> csrf.disable())
+                .cors(Customizer.withDefaults())
                 .sessionManagement(sm -> sm.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                 .authorizeHttpRequests(auth -> auth
+                        .requestMatchers(HttpMethod.OPTIONS, "/**").permitAll()
                         .requestMatchers(HttpMethod.POST, "/api/usr/auth/login").permitAll()
                         .anyRequest().authenticated()
                 )
diff --git a/scripts/seed-dev-admin.sh b/scripts/seed-dev-admin.sh
new file mode 100755
index 0000000..321b287
--- /dev/null
+++ b/scripts/seed-dev-admin.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Seed a dev admin user (sUserName=admin, password=666666).
+# Run once after first `mvn spring-boot:run` so Flyway has applied V1.
+# Idempotent: uses INSERT IGNORE on the unique key.
+
+set -euo pipefail
+
+DB_HOST="${DB_HOST:-127.0.0.1}"
+DB_PORT="${DB_PORT:-3306}"
+DB_SCHEMA="${DB_SCHEMA:-xly_erp}"
+DB_USER="${DB_USER:-root}"
+
+# BCrypt(666666) cost 10. Spring's BCryptPasswordEncoder accepts both $2a$ and $2b$ prefixes.
+HASH='$2b$10$ZzbGP0yWo3QJkaiZqEgtAOQVrzrti911VqbY7FoethhGQFPV0/Oj6'
+
+mysql -h "$DB_HOST" -P "$DB_PORT" -u "$DB_USER" ${DB_PASSWORD:+-p"$DB_PASSWORD"} "$DB_SCHEMA" <<SQL
+INSERT IGNORE INTO tUser
+  (sBrandsId, sSubsidiaryId, tCreateDate,
+   sUserNo, sUserName, sUserType, sLanguage, bCanModifyDocs,
+   sPasswordHash, sCreatedBy, bDeleted)
+VALUES
+  ('XLY', 'XLY', NOW(),
+   'admin', 'admin', '超级管理员', 'zh', 1,
+   '$HASH', 'system', 0);
+SQL
+
+echo "Seeded dev admin: sUserName=admin / password=666666"