feat(xray): autocomplete geosite/geoip categories in the routing rule editor

Writing a routing rule today means remembering exact geosite:/geoip:/
ext:file:code syntax by hand, with no way to discover what categories
actually exist in the .dat files sitting in the bin folder -- including
custom ones like geosite_roscom.dat added via the Geodata auto-update
feature. The Domain/IP fields in the rule editor now suggest categories
as you type (e.g. "you" -> "geosite:youtube"), built live from whatever
.dat files are actually on disk, while still accepting any free-typed
value exactly as before.

Backend: GET /panel/api/xray/getGeodataCategories scans the bin folder,
parses matched geosite*/geoip*.dat files via xray-core's own exported
protobuf types, and formats each category as the exact rule syntax
xray-core's parser accepts -- geosite:/geoip: for the default files,
ext:<file>:<code> for anything else (there's no shorthand for custom
files). Cached in memory keyed by each file's (name, size, modTime) so
a request-time scan is cheap until a file actually changes.

Frontend: the Domain/IP inputs become Select "tags" fields fed by a new
useGeodataCategories() query hook, with an explicit substring filter so
"you" matches "geosite:youtube" (not a prefix). The array<->CSV-string
adapter lives entirely at the FormField transform boundary, so the
underlying form schema and saved rule shape are unchanged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/web/controller/xray_setting_geodata_test.go

@@ -0,0 +1,64 @@
+package controller
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/xtls/xray-core/common/geodata"
+	"google.golang.org/protobuf/proto"
+)
+
+// TestGetGeodataCategoriesEndpoint exercises the real HTTP route (gin
+// routing, controller wiring, JSON envelope) rather than just the
+// underlying service function -- a genuine end-to-end check of
+// GET /panel/api/xray/getGeodataCategories given no DB is available in
+// this environment (go-sqlite3 needs cgo) to run the full panel binary.
+func TestGetGeodataCategoriesEndpoint(t *testing.T) {
+	dir := t.TempDir()
+	t.Setenv("XUI_BIN_FOLDER", dir)
+
+	writeFixture(t, filepath.Join(dir, "geosite.dat"), &geodata.GeoSiteList{
+		Entry: []*geodata.GeoSite{{Code: "YOUTUBE"}},
+	})
+	writeFixture(t, filepath.Join(dir, "geosite_roscom.dat"), &geodata.GeoSiteList{
+		Entry: []*geodata.GeoSite{{Code: "SOME-CODE"}},
+	})
+	writeFixture(t, filepath.Join(dir, "geoip.dat"), &geodata.GeoIPList{
+		Entry: []*geodata.GeoIP{{Code: "PRIVATE"}},
+	})
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	NewXraySettingController(router.Group("/panel/api"))
+
+	req := httptest.NewRequest(http.MethodGet, "/panel/api/xray/getGeodataCategories", nil)
+	resp := httptest.NewRecorder()
+	router.ServeHTTP(resp, req)
+
+	if resp.Code != http.StatusOK {
+		t.Fatalf("status = %d, want 200; body=%s", resp.Code, resp.Body.String())
+	}
+
+	body := resp.Body.String()
+	for _, want := range []string{`"success":true`, `"geosite:youtube"`, `"ext:geosite_roscom.dat:some-code"`, `"geoip:private"`} {
+		if !strings.Contains(body, want) {
+			t.Errorf("response body %s does not contain %s", body, want)
+		}
+	}
+}
+
+func writeFixture(t *testing.T, path string, msg proto.Message) {
+	t.Helper()
+	data, err := proto.Marshal(msg)
+	if err != nil {
+		t.Fatalf("marshal fixture %s: %v", path, err)
+	}
+	if err := os.WriteFile(path, data, 0o644); err != nil {
+		t.Fatalf("write fixture %s: %v", path, err)
+	}
+}