feat(amneziawg): add AmneziaWG as an outbound protocol (#6320)

* feat(amneziawg): add AmneziaWG as an outbound protocol

- AmneziaWG outbound protocol end-to-end: config schema, socks bridge, netstack, panel UI
- Route amneziawg outbounds to HTTP probe in TCP mode (backend + frontend classifiers) with pinning test
- Add 2-minute idle read deadline to pumpUDPEgress to reap idle egress sessions
- Require SOCKS5 username/password auth on the egress server (reject NO-AUTH with 0xFF) with test
- Bound the egress TCP tunnel dial with portForwardDialTimeout (10s), matching portfwd.go
- Resolve UDP domain targets off the association's reader loop via deliverUDPDatagram; race-safe getOrDial starts the reply pump at session creation; client passed by value into resolver goroutines (pinned by TestEgressUDPDatagramDomainInterleavedClients)
- Reconcile early-returns on an empty desired set and closes the egress listener; EgressBasePort (64900) is reserved against local inbound port conflicts like the internal API port, with pinning tests for both the port reservation (TestCheckPortConflict_EgressPortBlockedLocal) and the Reconcile empty-desired Close/Listen lifecycle (TestOutboundManagerReconcileEmptyDesiredClosesEgress)
- Eliminate acceptLoop shutdown race by validating listener != nil and registering to tracked under s.mu before wg.Add; bound pre-auth handshake with deadline (pinned by TestEgressServerCloseDuringConcurrentAccepts)
- Support AAAA and dual-stack domain resolution in tunnel DNS resolver with v6 default fallback (DefaultTunnelDNSServerV6); add DNS field to frontend protocol form; avoid unneeded cache flushes on unchanged SetStack ticks

* fix(amneziawg): resolve IPv6-only DNS default fallback and validate required keys

- Default to IPv6 tunnel DNS on IPv6-only outbounds with blank dns
- Require non-empty secretKey and peer publicKey in ValidateAmneziaWGOutbound
- Add end-to-end IPv6 tunnel domain resolution test and test empty key rejection
- Trim comment blocks exceeding 2 lines across modified files
- Fix Storybook test execution on environments with POSIX locale

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

---------

Co-authored-by: rqzbeh <rqzbeh@users.noreply.github.com>
Co-authored-by: Claude Code <noreply@anthropic.com>
Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

internal/web/service/outbound/probe_http_test.go

@@ -557,6 +557,33 @@ func TestTestOutboundsTCPModeForcesUDPToHTTPProbe(t *testing.T) {
 	}
 }
 
+func TestTestOutboundsTCPModeForcesAmneziaWGToHTTPProbe(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	withStubProcess(t, func(cfg *xray.Config, configPath string) batchProcess {
+		return &stubProcess{cfg: cfg, serveSocks: true}
+	})
+	withEgressTraceProbe(t, func(*url.URL) *TestEgressResult {
+		return &TestEgressResult{IPv4: "198.51.100.2", Country: "ZZ", Warp: "off"}
+	})
+
+	batch := mustJSON(t, []any{map[string]any{"tag": "awg", "protocol": "amneziawg"}})
+	results, err := (&OutboundService{}).TestOutbounds(batch, srv.URL, "", "tcp")
+	if err != nil {
+		t.Fatalf("TestOutbounds: %v", err)
+	}
+	r := results[0]
+	if !r.Success || r.Mode != "http" {
+		t.Errorf("amneziawg outbound in tcp mode = %+v, want success with mode %q", r, "http")
+	}
+	if r.Egress == nil || r.Egress.IPv4 != "198.51.100.2" {
+		t.Errorf("amneziawg outbound egress = %+v", r.Egress)
+	}
+}
+
 func TestProbeModeLabel(t *testing.T) {
 	cases := []struct{ mode, want string }{
 		{"tcp", "tcp"},