feat: complete Tasks 21-28 — backend integration, security hardening, UI tests & CI

- Add Apple Sign-In backend (JWKS verification, account linking, session management)
- Implement push notification deep linking with NotificationDeepLinkRouter
- Add jailbreak detection, runtime integrity monitoring, secure enclave service
- Implement OAuth social login, token refresh, and secure logout flows
- Add image caching (memory/disk), optimizer, upload queue, async semaphore
- Implement notification analytics, type preferences, and category setup
- Expand UI test suite with UITestBase, accessibility, auth flow, performance tests
- Add CI pipeline for iOS UI tests (3 device sizes) and performance benchmarks
- Restructure Xcode project to manual groups with KordantWidgets target
- Add SwiftLint, Swift Collections/Algorithms/GoogleSignIn dependencies
- Update project.yml for XcodeGen with new targets and configurations

iOS/TestPlans/PerformanceTests.xctestplan

@@ -0,0 +1,125 @@
+{
+  "configurations" : [
+    {
+      "name" : "iPhone 15 Pro Max",
+      "options" : {
+        "targetForVariableExpansion" : {
+          "containerPath" : "container:Kordant.xcodeproj",
+          "identifier" : "Kordant",
+          "name" : "Kordant"
+        }
+      },
+      "testTargets" : [
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantUITests",
+            "name" : "KordantUITests"
+          }
+        },
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantTests",
+            "name" : "KordantTests"
+          }
+        }
+      ]
+    },
+    {
+      "name" : "iPhone 14",
+      "options" : {
+        "targetForVariableExpansion" : {
+          "containerPath" : "container:Kordant.xcodeproj",
+          "identifier" : "Kordant",
+          "name" : "Kordant"
+        }
+      },
+      "testTargets" : [
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantUITests",
+            "name" : "KordantUITests"
+          }
+        },
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantTests",
+            "name" : "KordantTests"
+          }
+        }
+      ]
+    },
+    {
+      "name" : "iPhone SE (3rd generation)",
+      "options" : {
+        "targetForVariableExpansion" : {
+          "containerPath" : "container:Kordant.xcodeproj",
+          "identifier" : "Kordant",
+          "name" : "Kordant"
+        }
+      },
+      "testTargets" : [
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantUITests",
+            "name" : "KordantUITests"
+          }
+        },
+        {
+          "target" : {
+            "containerPath" : "container:Kordant.xcodeproj",
+            "identifier" : "KordantTests",
+            "name" : "KordantTests"
+          }
+        }
+      ]
+    }
+  ],
+  "defaultOptions" : {
+    "commandLineArgumentEntries" : [
+      {
+        "argument" : "-UITesting"
+      }
+    ],
+    "environmentVariableEntries" : [
+      {
+        "variable" : "UITestScenario",
+        "value" : "populatedDashboard"
+      }
+    ],
+    "screenshotDataLifetime" : "keepAlways",
+    "testTimeoutsEnabled" : true,
+    "testTimeoutsDuration" : 600
+  },
+  "testTargets" : [
+    {
+      "target" : {
+        "containerPath" : "container:Kordant.xcodeproj",
+        "identifier" : "KordantUITests",
+        "name" : "KordantUITests"
+      },
+      "selectedTests" : [
+        "DataLoadingPerformanceTests",
+        "LaunchPerformanceTests",
+        "MemoryPerformanceTests",
+        "NavigationPerformanceTests",
+        "ScrollPerformanceTests"
+      ]
+    },
+    {
+      "target" : {
+        "containerPath" : "container:Kordant.xcodeproj",
+        "identifier" : "KordantTests",
+        "name" : "KordantTests"
+      },
+      "selectedTests" : [
+        "XCTMetricPerformanceTests"
+      ]
+    }
+  ],
+  "version" : 1
+}