chore(repo): drop unused npm/yarn lockfiles and fix inline FQNs

- Remove mateclaw-ui/package-lock.json and yarn.lock. This is a pnpm
  monorepo where pnpm-lock.yaml is the only lockfile; the npm/yarn locks
  were stray duplicates. Add a .gitignore rule so they are not committed
  again by mistake.
- SourceEvidenceLedger: reference Pattern/Matcher by their imported
  simple names instead of inline fully-qualified names.

.gitignore

@@ -111,3 +111,8 @@ scripts/.*-sync-state.json
 # Sandbox / external client work that lives in this directory
 # but should not ship in the repo.
 outputs/
+
+# This is a pnpm monorepo — pnpm-lock.yaml is the only lockfile we track.
+# Ignore stray npm/yarn lockfiles so they are not committed by mistake.
+package-lock.json
+yarn.lock

mateclaw-server/src/main/java/vip/mate/agent/graph/state/SourceEvidenceLedger.java

@@ -231,7 +231,7 @@ public record SourceEvidenceLedger(
         // exists, insert one before the first source line so the frontend
         // preprocessWikiCitations() can locate the source table.
         if (additions.isEmpty() && !result.contains("来源：")) {
-            java.util.regex.Matcher firstSource = java.util.regex.Pattern
+            Matcher firstSource = Pattern
                     .compile("(?m)^\\[")
                     .matcher(result);
             if (firstSource.find()) {
@@ -303,7 +303,7 @@ public record SourceEvidenceLedger(
     private static String replaceSourceLine(String answer, int index, String canonicalLine) {
         Pattern pattern = Pattern.compile("(?m)^\\s*\\[" + index + "\\]\\s+.+$");
         return pattern.matcher(answer).replaceFirst(
-                java.util.regex.Matcher.quoteReplacement(canonicalLine));
+                Matcher.quoteReplacement(canonicalLine));
     }
 
     private boolean hasFileName(String fileName) {