release: 1.9.0: Per-application client IP allow-list and rate-limit overrides

Application sending controls: client IP allow-list for authorization, and level-2 rate limits that override the domain ceiling per application.
Added:
  - Per-application **client IP allow-list** on the domain page: when enabled,
  - SQLite migration `0009_application_auth_ips.sql` (moves legacy trusted IPs
Changed:
  - Application level-2 rate limit **overrides** the domain limit for that login
  - Domain export/import carries `auth_ip_restrict` / `auth_allowed_ips`; legacy
  - Panel help, Settings, and [guide.md](docs/guide.md) describe override semantics
  - [guide.md](docs/guide.md): full-backup section documents all four capture

Full detail: CHANGELOG.md (1.9.0).

test/e2e/negative_test.go

@@ -26,7 +26,7 @@ func testLevel2RateLimit(t *testing.T, sc *scenario) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if err := sc.panel.setRateLimit(fmt.Sprintf("/applications/%s/ratelimit", appID), ip, 1, 3600); err != nil {
+	if err := sc.panel.setRateLimit(fmt.Sprintf("/applications/%s/ratelimit", appID), 1, 3600); err != nil {
 		t.Fatalf("save application rate limit: %v", err)
 	}