refactor(ios): Phase 9A — Add Config.swift + KillSwitchService.swift

- Create Shared/Cloud/Config.swift with shared BLPlatformConfig for ChronoMind
- Create Shared/Cloud/KillSwitchService.swift thin wrapper over BLKillSwitchClient

Part of Mobile DRY Refactoring Roadmap Phase 9A.

ios/ChronoMind/Shared/Cloud/Config.swift

@@ -0,0 +1,13 @@
+// ── ChronoMind Platform Config ──────────────────────────────
+// Single source of truth for BLPlatformConfig used by all SDK wrappers.
+
+import ByteLystPlatformSDK
+
+enum ChronoMindConfig {
+    static let platform: BLPlatformConfig = BLPlatformConfig.fromInfoPlist(
+        productId: "chronomind",
+        defaultBaseURL: "https://api.chronomind.app",
+        bundleId: "com.saravana.chronomind",
+        appGroupId: "group.com.chronomind.shared"
+    )
+}

ios/ChronoMind/Shared/Cloud/KillSwitchService.swift

@@ -0,0 +1,12 @@
+// ── Kill Switch Service ──────────────────────────────────────
+// Thin wrapper over ByteLystPlatformSDK's BLKillSwitchClient.
+
+import ByteLystPlatformSDK
+
+enum KillSwitchService {
+    private static let client = BLKillSwitchClient(config: ChronoMindConfig.platform)
+
+    static func check() async -> BLKillSwitchResult {
+        await client.check()
+    }
+}