feat: HSM main/slave certificate comparison with batch SQL generation

- compare usercert_tab by subject raw bytes + certtype
- generate single annotated CSV report
- generate merge-<timestamp>.sql in current directory for DBA execution
- preserve GBK DN bytes via ATTACH + INSERT OR REPLACE / UPDATE
- compatible with sqlite3 3.6.20 and JDK 1.8

src/main/java/com/sunyard/certcompare/model/CompareRow.java

@@ -0,0 +1,36 @@
+package com.sunyard.certcompare.model;
+
+import com.sunyard.certcompare.util.Text;
+
+import java.util.List;
+
+/**
+ * 报表中的一行差异记录。
+ */
+public class CompareRow {
+
+    public final CompareCategory category;
+    public final CertKey key;
+    public final CertRecord main;
+    public final CertRecord slave;
+    public final List<FieldDiff> diffs;
+    public final List<String> notes;
+    public final String defaultChoice;
+    public final String dnText;
+
+    public CompareRow(CompareCategory category, CertKey key, CertRecord main, CertRecord slave,
+                      List<FieldDiff> diffs, List<String> notes, String defaultChoice, String dnText) {
+        this.category = category;
+        this.key = key;
+        this.main = main;
+        this.slave = slave;
+        this.diffs = diffs;
+        this.notes = notes;
+        this.defaultChoice = defaultChoice;
+        this.dnText = dnText == null ? "" : dnText;
+    }
+
+    public String cn() {
+        return Text.cnFromDn(dnText);
+    }
+}