feat: add admin panel with multi-chain support and notification system

- Add full admin REST API: auth, API keys, chains, chain tokens, wallets,
  orders, RPC nodes, settings, dashboard stats, notifications
- Add JWT-based admin authentication and API key auth middleware
- Add multi-chain listeners: BSC, ETH, Polygon, Plasma, EVM WebSocket
- Add RPC node health check job with automatic failover
- Add Telegram notification channel for order events
- Add installer for first-run database initialization
- Add new DB models: admin_user, api_key, chain, chain_token,
  rpc_node, settings, notification_channel
- Add order statistics aggregation (daily/monthly/by-chain)
- Serve built admin SPA from embedded www/ assets
- Add comprehensive test coverage for all new features

src/telegram/telegram_test.go

@@ -0,0 +1,135 @@
+package telegram
+
+import (
+	"testing"
+
+	"github.com/assimon/luuu/config"
+	"github.com/assimon/luuu/internal/testutil"
+	"github.com/assimon/luuu/model/dao"
+	"github.com/assimon/luuu/model/data"
+	"github.com/assimon/luuu/model/mdb"
+)
+
+func withTelegramEnv(token, proxy string, manage int64, fn func()) {
+	origToken := config.TgBotToken
+	origProxy := config.TgProxy
+	origManage := config.TgManage
+	defer func() {
+		config.TgBotToken = origToken
+		config.TgProxy = origProxy
+		config.TgManage = origManage
+	}()
+
+	config.TgBotToken = token
+	config.TgProxy = proxy
+	config.TgManage = manage
+	fn()
+}
+
+func TestLoadCommandBotConfig_DoesNotUseEnvFallbackWhenNoChannel(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	// Env config is present but settings table is empty —
+	// the bot must NOT fall back to config.TgBotToken.
+	withTelegramEnv("env-token", "http://127.0.0.1:7890", 123456789, func() {
+		cfg, source, err := loadCommandBotConfig()
+		if err != nil {
+			t.Fatalf("loadCommandBotConfig err: %v", err)
+		}
+		if cfg != nil {
+			t.Fatalf("expected nil config when settings table has no telegram keys, got %+v", cfg)
+		}
+		if source != "" {
+			t.Fatalf("source = %q, want empty", source)
+		}
+	})
+}
+
+func TestLoadCommandBotConfig_PrefersEnabledTelegramChannel(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	// Seed settings table with telegram credentials.
+	dao.Mdb.Create(&mdb.Setting{Group: "system", Key: "system.telegram_bot_token", Value: "db-token", Type: "string"})
+	dao.Mdb.Create(&mdb.Setting{Group: "system", Key: "system.telegram_chat_id", Value: "987654321", Type: "string"})
+	_ = data.ReloadSettings()
+
+	withTelegramEnv("env-token", "", 123456789, func() {
+		cfg, source, err := loadCommandBotConfig()
+		if err != nil {
+			t.Fatalf("loadCommandBotConfig err: %v", err)
+		}
+		if cfg == nil {
+			t.Fatal("expected non-nil config")
+		}
+		if source != "settings" {
+			t.Fatalf("source = %q, want %q", source, "settings")
+		}
+		if cfg.BotToken != "db-token" {
+			t.Fatalf("bot token = %q, want %q", cfg.BotToken, "db-token")
+		}
+		if cfg.ChatID != 987654321 {
+			t.Fatalf("chat id = %d, want %d", cfg.ChatID, int64(987654321))
+		}
+	})
+}
+
+func TestLoadCommandBotConfig_ReturnsNilWhenNoChannelAndNoEnv(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	// Fresh DB — ensure the cache doesn't carry over values from a previous test.
+	_ = data.ReloadSettings()
+
+	withTelegramEnv("", "", 0, func() {
+		cfg, source, err := loadCommandBotConfig()
+		if err != nil {
+			t.Fatalf("loadCommandBotConfig err: %v", err)
+		}
+		if cfg != nil {
+			t.Fatalf("expected nil config, got %+v", cfg)
+		}
+		if source != "" {
+			t.Fatalf("source = %q, want empty", source)
+		}
+	})
+}
+
+func TestLoadCommandBotConfig_SkipsEmptyConfigChannel(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	// Only chat_id present, no bot_token → should return nil.
+	dao.Mdb.Create(&mdb.Setting{Group: "system", Key: "system.telegram_chat_id", Value: "987654321", Type: "string"})
+	_ = data.ReloadSettings()
+
+	cfg, source, err := loadCommandBotConfig()
+	if err != nil {
+		t.Fatalf("loadCommandBotConfig err: %v", err)
+	}
+	if cfg != nil {
+		t.Fatalf("expected nil config when bot_token is absent, got %+v", cfg)
+	}
+	if source != "" {
+		t.Fatalf("source = %q, want empty", source)
+	}
+}
+
+func TestLoadCommandBotConfig_SkipsInvalidAndUsesNextValid(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	// bot_token present but chat_id is not a valid int → should return error.
+	dao.Mdb.Create(&mdb.Setting{Group: "system", Key: "system.telegram_bot_token", Value: "db-token", Type: "string"})
+	dao.Mdb.Create(&mdb.Setting{Group: "system", Key: "system.telegram_chat_id", Value: "not-a-number", Type: "string"})
+	_ = data.ReloadSettings()
+
+	cfg, _, err := loadCommandBotConfig()
+	if err == nil {
+		t.Fatal("expected error for invalid chat_id, got nil")
+	}
+	if cfg != nil {
+		t.Fatalf("expected nil config on parse error, got %+v", cfg)
+	}
+}