Add C# bridges and coordinator service

- geviscope-bridge: GeViScope SDK REST wrapper (:7720)
- gcore-bridge: G-Core SDK REST wrapper (:7721)
- geviserver-bridge: GeViServer REST wrapper (:7710)
- copilot-coordinator: WebSocket coordination hub (:8090)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

copilot-coordinator/Models/CameraLock.cs

@@ -0,0 +1,36 @@
+namespace CopilotCoordinator.Models;
+
+public record CameraLock(
+    int CameraId,
+    CameraLockPriority Priority,
+    string OwnerName,
+    DateTime OwnedSince,
+    DateTime ExpiresAt
+);
+
+public enum CameraLockPriority { None, High, Low }
+
+public enum CameraLockNotificationType
+{
+    Acquired,
+    TakenOver,
+    ConfirmTakeOver,
+    Confirmed,
+    Rejected,
+    ExpireSoon,
+    Unlocked
+}
+
+public record CameraLockResult(bool Acquired, CameraLock? Lock);
+
+public record CameraLockNotification(
+    CameraLockNotificationType Type,
+    int CameraId,
+    string CopilotName
+);
+
+public record LockRequest(int CameraId, string KeyboardId, string Priority = "low");
+public record UnlockRequest(int CameraId, string KeyboardId);
+public record TakeoverRequest(int CameraId, string KeyboardId, string Priority = "low");
+public record TakeoverConfirmRequest(int CameraId, string KeyboardId, bool Confirm);
+public record ResetExpirationRequest(int CameraId, string KeyboardId);