Add debug exception resolver for troubleshooting

src/main/kotlin/com/android/trisolarisserver/config/DebugExceptionResolver.kt

@@ -0,0 +1,23 @@
+package com.android.trisolarisserver.config
+
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
+import org.springframework.stereotype.Component
+import org.springframework.web.servlet.HandlerExceptionResolver
+import org.springframework.web.servlet.ModelAndView
+
+@Component
+class DebugExceptionResolver : HandlerExceptionResolver {
+    override fun resolveException(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        handler: Any?,
+        ex: Exception
+    ): ModelAndView? {
+        if (request.getHeader("X-Debug-Auth") == "1" && !response.isCommitted) {
+            val msg = ex.message?.take(200) ?: ""
+            response.setHeader("X-Exception", "${ex::class.java.simpleName}:$msg")
+        }
+        return null
+    }
+}