fix: remove duplicate findEndpointNeighborsBatch in GraphStore (build fix)

The merge of feat/phase5-dashboard-redesign into main introduced a duplicate
definition of findEndpointNeighborsBatch(List<String>). Both versions had
identical semantics but different implementation style:

Kept: the first (from the backend chain PRs #12-16) which uses
NodeKind.ENDPOINT.getValue() for type safety and UNWIND/MATCH pattern
with $ids parameter.

Removed: the second (from phase5) which used string literals
('ENDPOINT', 'WEBSOCKET_ENDPOINT') and IN $nodeIds pattern.

Fixes: compilation failure on main (javac error: method already defined).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

Author: aksOps

src/main/java/io/github/randomcodespace/iq/graph/GraphStore.java

@@ -335,31 +335,6 @@ public List<CodeNode> findIncomingNeighbors(String nodeId) {
                 Map.of("nodeId", nodeId));
     }
 
-    /**
-     * Batch-find all ENDPOINT/WEBSOCKET_ENDPOINT neighbors for a list of node IDs in one query.
-     * Returns a map of sourceNodeId -> list of endpoint neighbor nodes.
-     */
-    public Map<String, List<CodeNode>> findEndpointNeighborsBatch(List<String> nodeIds) {
-        Map<String, List<CodeNode>> result = new java.util.LinkedHashMap<>();
-        if (nodeIds.isEmpty()) return result;
-        try (Transaction tx = graphDb.beginTx()) {
-            var queryResult = tx.execute(
-                    "MATCH (n:CodeNode)-[]-(m:CodeNode) "
-                            + "WHERE n.id IN $nodeIds AND m.kind IN ['ENDPOINT', 'WEBSOCKET_ENDPOINT'] "
-                            + "RETURN n.id AS sourceId, m",
-                    Map.of("nodeIds", nodeIds));
-            while (queryResult.hasNext()) {
-                var row = queryResult.next();
-                String sourceId = (String) row.get("sourceId");
-                Object val = row.get("m");
-                if (val instanceof org.neo4j.graphdb.Node neo4jNode) {
-                    result.computeIfAbsent(sourceId, k -> new ArrayList<>()).add(nodeFromNeo4j(neo4jNode));
-                }
-            }
-        }
-        return result;
-    }
-
     public long count() {
         try (Transaction tx = graphDb.beginTx()) {
             var result = tx.execute("MATCH (n:CodeNode) RETURN count(n) AS cnt");