fix(api): Mark effective org ID helper as internal

Annotate SentryOptions.getEffectiveOrgId with ApiStatus.Internal since it is used as an internal helper for trace propagation org ID resolution.

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

sentry/src/main/java/io/sentry/SentryOptions.java

@@ -2335,6 +2335,7 @@ public void setOrgId(final @Nullable String orgId) {
   /**
    * Returns the effective org ID, preferring the explicit config option over the DSN-parsed value.
    */
+  @ApiStatus.Internal
   public @Nullable String getEffectiveOrgId() {
     if (orgId != null) {
       return orgId;