network: add hub registration, Redis persistence, and federated mesh join protocol

- Change default P2P port from 7070 to 8001 in config and .env.example
- Add redis_url configuration option for hub persistence (default: redis://localhost:6379)
- Implement DNS-based hub registration/unregistration via HTTPS API endpoints
- Add Redis persistence for hub registrations with 1-hour TTL
- Add island join request/response protocol with member list and blockchain credentials
- Add GPU marketplace tracking (offers, bids, providers) in hub manager
- Add

scripts/plan/02_network_infrastructure.sh

@@ -109,9 +109,9 @@ class P2PDiscovery:
         """Add bootstrap node for initial connection"""
         self.bootstrap_nodes.append((address, port))
     
-    def generate_node_id(self, address: str, port: int, public_key: str) -> str:
-        """Generate unique node ID from address, port, and public key"""
-        content = f"{address}:{port}:{public_key}"
+    def generate_node_id(self, hostname: str, address: str, port: int, public_key: str) -> str:
+        """Generate unique node ID from hostname, address, port, and public key"""
+        content = f"{hostname}:{address}:{port}:{public_key}"
         return hashlib.sha256(content.encode()).hexdigest()
     
     async def start_discovery(self):
@@ -2343,17 +2343,18 @@ class TestP2PDiscovery:
     
     def test_generate_node_id(self):
         """Test node ID generation"""
+        hostname = "node1.example.com"
         address = "127.0.0.1"
         port = 8000
         public_key = "test_public_key"
-        
-        node_id = self.discovery.generate_node_id(address, port, public_key)
-        
+
+        node_id = self.discovery.generate_node_id(hostname, address, port, public_key)
+
         assert isinstance(node_id, str)
         assert len(node_id) == 64  # SHA256 hex length
-        
+
         # Test consistency
-        node_id2 = self.discovery.generate_node_id(address, port, public_key)
+        node_id2 = self.discovery.generate_node_id(hostname, address, port, public_key)
         assert node_id == node_id2
     
     def test_add_bootstrap_node(self):
@@ -2367,17 +2368,18 @@ class TestP2PDiscovery:
     
     def test_generate_node_id_consistency(self):
         """Test node ID generation consistency"""
+        hostname = "node2.example.com"
         address = "192.168.1.1"
         port = 9000
         public_key = "test_key"
-        
-        node_id1 = self.discovery.generate_node_id(address, port, public_key)
-        node_id2 = self.discovery.generate_node_id(address, port, public_key)
-        
+
+        node_id1 = self.discovery.generate_node_id(hostname, address, port, public_key)
+        node_id2 = self.discovery.generate_node_id(hostname, address, port, public_key)
+
         assert node_id1 == node_id2
-        
+
         # Different inputs should produce different IDs
-        node_id3 = self.discovery.generate_node_id("192.168.1.2", port, public_key)
+        node_id3 = self.discovery.generate_node_id(hostname, "192.168.1.2", port, public_key)
         assert node_id1 != node_id3
     
     def test_get_peer_count_empty(self):