feat(jwt): extend token expiration time and improve authentication filter

- Extend JWT token expiration from 1 hour to 30 days
- Improve Authorization header validation in authentication filter
- Add null check for header before calling startsWith method
- Import Strings utility class for better string handling

weblog-module-jwt/src/main/java/com/hanserwei/jwt/filter/TokenAuthenticationFilter.java

@@ -45,7 +45,7 @@ public class TokenAuthenticationFilter extends OncePerRequestFilter {
         String header = request.getHeader("Authorization");
 
         // 2. 校验头格式 (必须以 Bearer 开头)
-        if (StringUtils.startsWith(header, "Bearer ")) {
+        if (header != null && header.startsWith("Bearer ")) {
             String token = StringUtils.substring(header, 7);
             log.info("JWT Token: {}", token);
             if (StringUtils.isNotBlank(token)) {

weblog-module-jwt/src/main/java/com/hanserwei/jwt/utils/JwtTokenHelper.java

@@ -80,7 +80,7 @@ public class JwtTokenHelper implements InitializingBean {
      */
     public String generateToken(String username) {
         Instant now = Instant.now();
-        Instant expireTime = now.plus(1, ChronoUnit.HOURS);
+        Instant expireTime = now.plus(30, ChronoUnit.DAYS);
 
         return Jwts.builder()
                 .header().add("type", "JWT").and() // 推荐添加 header