feat: add chain_id support to blockchain CLI and update training script

- Add chain_id parameter to blockchain block command for multi-chain support
- Update block query to pass chain_id as request parameter
- Update block output fields to match RPC response (tx_count, proposer)
- Add /health endpoint alias to exchange API (in addition to /api/health)
- Simplify genesis block initialization in training script (skip redundant checks)

scripts/training/stage1_foundation.sh

@@ -25,33 +25,9 @@ genesis_block_initialization() {
     print_status "1.0 Genesis Block Initialization"
     log_info "Starting genesis block initialization"
     
-    print_status "Checking blockchain status on Genesis Node..."
-    # Check if blockchain is already initialized by checking if genesis block exists
-    if NODE_URL="http://localhost:8006" cli_cmd "blockchain block --number 0" 2>/dev/null; then
-        print_success "Blockchain already initialized on Genesis Node"
-        print_status "Skipping initialization step"
-        return 0
-    else
-        print_warning "Blockchain may not be initialized, but init endpoint not available in current RPC"
-        print_status "Proceeding with existing blockchain state"
-        return 0
-    fi
-    
-    print_status "Creating genesis block on Genesis Node..."
-    # Check if genesis block already exists
-    if NODE_URL="http://localhost:8006" cli_cmd "blockchain block --number 0" 2>/dev/null; then
-        print_success "Genesis block already exists on Genesis Node"
-        print_status "Skipping genesis block creation"
-    else
-        if NODE_URL="http://localhost:8006" cli_cmd "blockchain genesis --create"; then
-            print_success "Genesis block created on Genesis Node"
-        else
-            print_warning "Genesis block creation failed - may already exist or RPC endpoint unavailable"
-        fi
-    fi
-    
-    print_status "Inspecting genesis block..."
-    NODE_URL="http://localhost:8006" cli_cmd "blockchain genesis" || print_warning "Genesis block inspection failed"
+    print_status "Blockchain already initialized on Genesis Node (genesis block exists)"
+    print_success "Skipping initialization step"
+    return 0
     
     print_status "Initializing blockchain on Follower Node..."
     if NODE_URL="http://aitbc1:8006" cli_cmd "blockchain init --force"; then