fix: drop nodes that fail geo detection in collection rename

Nodes whose country cannot be detected are now filtered out instead of
kept with their original name. This prevents unlabelled/unrenamed nodes
from appearing in collection output.

internal/filter/collection_rename.go

@@ -30,17 +30,18 @@ func resolveRenameOptions(opts *model.RenameOptions) model.RenameOptions {
 
 // RenameCollectionNodes renames proxy nodes in the collection-level format:
 //
-//	[emoji country flag] [alias] [country name] [city] [-1...-N]
+//	[emoji country flag] [alias] [country name] [city] [01...NN]
 //
 // The alias is read from each node's "_sourceAlias" field (tagged by the
 // subscription service from the source's Alias). Geographic info (flag,
 // country, city) is auto-detected from the node's original name and server.
 //
 // Nodes are grouped by their **display baseName** (the name without the index
-// suffix) and numbered sequentially within each group, starting at 1. This
-// ensures that nodes producing the same display name get unique suffixes
-// (-1, -2, -3, …) in a single pass, so EnsureUniqueProxyNames never needs to
-// append a secondary suffix.
+// suffix) and numbered sequentially within each group, starting at 1.
+//
+// Nodes whose geographic info cannot be detected (no country found) are
+// dropped from the output — they cannot be meaningfully renamed and would
+// appear as unlabelled entries in the collection.
 //
 // opts controls which fields are included in the output. A nil opts means all
 // fields are included (full default format).
@@ -54,13 +55,12 @@ func RenameCollectionNodes(proxies []model.ProxyNode, opts *model.RenameOptions)
 	// First pass: compute display baseName (without index) for each node.
 	type nodeInfo struct {
 		proxy    model.ProxyNode
-		baseName string // display name without index suffix; "" means skip rename
+		baseName string // display name without index suffix; "" means geo failed
 	}
 
-	infos := make([]nodeInfo, len(proxies))
-	for i, proxy := range proxies {
+	infos := make([]nodeInfo, 0, len(proxies))
+	for _, proxy := range proxies {
 		if proxy == nil {
-			infos[i] = nodeInfo{proxy: proxy}
 			continue
 		}
 
@@ -70,7 +70,7 @@ func RenameCollectionNodes(proxies []model.ProxyNode, opts *model.RenameOptions)
 
 		geo := util.DetectGeoWithServer(name, server)
 		if geo.CountryName == "" {
-			infos[i] = nodeInfo{proxy: proxy}
+			// Geo detection failed — skip this node
 			continue
 		}
 
@@ -96,34 +96,22 @@ func RenameCollectionNodes(proxies []model.ProxyNode, opts *model.RenameOptions)
 			parts = append(parts, geo.CityCN)
 		}
 
-		infos[i] = nodeInfo{
+		infos = append(infos, nodeInfo{
 			proxy:    proxy,
 			baseName: strings.Join(parts, " "),
-		}
+		})
 	}
 
 	// Count group sizes by baseName.
 	baseCounts := make(map[string]int)
 	for _, info := range infos {
-		if info.baseName != "" {
-			baseCounts[info.baseName]++
-		}
+		baseCounts[info.baseName]++
 	}
 
 	// Second pass: assign names with sequential numbering.
 	counters := make(map[string]int)
-	results := make([]model.ProxyNode, len(proxies))
-	for i, info := range infos {
-		if info.proxy == nil {
-			results[i] = info.proxy
-			continue
-		}
-		if info.baseName == "" {
-			// Geo detection failed — keep original name.
-			results[i] = info.proxy
-			continue
-		}
-
+	results := make([]model.ProxyNode, 0, len(infos))
+	for _, info := range infos {
 		counters[info.baseName]++
 		total := baseCounts[info.baseName]
 
@@ -135,7 +123,7 @@ func RenameCollectionNodes(proxies []model.ProxyNode, opts *model.RenameOptions)
 		next := cloneProxy(info.proxy)
 		delete(next, "_sourceAlias")
 		next["name"] = name
-		results[i] = next
+		results = append(results, next)
 	}
 
 	return results

internal/filter/collection_rename_test.go

@@ -110,12 +110,8 @@ func TestRenameCollectionNodes_UnknownCountry(t *testing.T) {
 		{"name": "Unknown Node", "type": "ss", "_sourceAlias": "A"},
 	}
 	result := RenameCollectionNodes(proxies, nil)
-	if len(result) != 1 {
-		t.Fatalf("expected 1 node, got %d", len(result))
-	}
-	// Should keep original name
-	if result[0]["name"] != "Unknown Node" {
-		t.Errorf("expected original name, got %q", result[0]["name"])
+	if len(result) != 0 {
+		t.Fatalf("expected 0 nodes (geo detection failed, should be filtered), got %d", len(result))
 	}
 }