fix: add missing API endpoints for CLI compatibility

- Add /v1/admin/status endpoint for system status
- Add /v1/blockchain/status endpoint for blockchain status
- Add /v1/blockchain/sync-status endpoint for sync status
- Add /v1/monitor/dashboard endpoint for monitoring dashboard
- Fix router imports and missing dependencies
- Handle optional dependencies gracefully (torch, tenseal)
- Update admin router with comprehensive system status endpoint
- Fix blockchain router endpoint paths
- Improve error handling in monitoring dashboard

These endpoints resolve CLI 404/405 errors reported in testing.

apps/coordinator-api/src/app/services/fhe_service.py

@@ -205,7 +205,13 @@ class FHEService:
     """Main FHE service for AITBC"""
 
     def __init__(self):
-        providers = {"tenseal": TenSEALProvider()}
+        providers = {}
+        
+        # TenSEAL provider
+        try:
+            providers["tenseal"] = TenSEALProvider()
+        except ImportError as e:
+            logging.warning(f"TenSEAL provider not available: {e}")
 
         # Optional Concrete ML provider
         try: