Fix review comments from copilot

- Add equals/hashCode to ThreadPolicy, replace toString() comparison
  in shared scheduler mismatch detection with proper equals().
- Duplicate queue name check was already fixed in previous commit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: wu-sheng

oap-server/server-library/library-batch-queue/src/main/java/org/apache/skywalking/oap/server/library/batchqueue/BatchQueueManager.java

@@ -80,7 +80,7 @@ static ScheduledExecutorService getOrCreateSharedScheduler(final String name,
                                                                 final ThreadPolicy threads) {
         SHARED_SCHEDULER_POLICIES.compute(name, (k, existing) -> {
             if (existing != null) {
-                if (!existing.toString().equals(threads.toString())) {
+                if (!existing.equals(threads)) {
                     log.warn("Shared scheduler [{}]: ThreadPolicy mismatch. "
                             + "Existing={}, requested={}. Using existing.",
                         name, existing, threads);

oap-server/server-library/library-batch-queue/src/main/java/org/apache/skywalking/oap/server/library/batchqueue/ThreadPolicy.java

@@ -94,6 +94,29 @@ public int resolve() {
         return Math.max(1, base + (int) Math.round(cpuMultiplier * Runtime.getRuntime().availableProcessors()));
     }
 
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        final ThreadPolicy that = (ThreadPolicy) o;
+        return fixedCount == that.fixedCount
+            && base == that.base
+            && Double.compare(that.cpuMultiplier, cpuMultiplier) == 0;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = fixedCount;
+        result = 31 * result + base;
+        final long temp = Double.doubleToLongBits(cpuMultiplier);
+        result = 31 * result + (int) (temp ^ (temp >>> 32));
+        return result;
+    }
+
     @Override
     public String toString() {
         if (fixedCount > 0) {