fix(ci): resolve 4 simple code quality issues (Round 1)

Applying minimal fixes following fix-ci-loop methodology:

1. Dependency Review Workflow:
   - Fixed: Cannot use both allow-licenses and deny-licenses
   - Removed allow-licenses parameter
   - Kept deny-licenses for GPL/AGPL restrictions

2. pkg/security/validation_test.go:666:
   - Fixed: undefined: strings
   - Added missing "strings" import

3. pkg/websocket/server.go:123:
   - Fixed: Context cancel function not used on all paths
   - Added defer cancel() after context creation

4. examples/claude_cli_demo.go:24:
   - Fixed: fmt.Println arg list ends with redundant newline
   - Replaced "\n" in string with explicit fmt.Println()

Files Modified:
- .github/workflows/dependency-review.yml
- examples/claude_cli_demo.go
- pkg/security/validation_test.go
- pkg/websocket/server.go

Expected Impact:
- Dependency Review workflow should now pass
- 4 go vet errors resolved
- Remaining: ~17 errors (mostly in tn/manager and adapters/vnf-operator)

Next Round: Will address test redeclarations and undefined methods

Author: thc1006

.github/workflows/dependency-review.yml

@@ -42,12 +42,10 @@ jobs:
         fail-on-severity: critical
         # Comment on PR with results
         comment-summary-in-pr: true
-        # Deny specific licenses
+        # Deny specific licenses (cannot use both allow and deny)
         deny-licenses: GPL-2.0, GPL-3.0, AGPL-1.0, AGPL-3.0
         # Allow all other vulnerabilities but warn
         warn-only: true
-        # Allow specific licenses
-        allow-licenses: MIT, Apache-2.0, BSD-2-Clause, BSD-3-Clause, ISC
         # Enable vulnerability database check
         vulnerability-check: true
         # Enable license check

examples/claude_cli_demo.go

@@ -21,7 +21,8 @@ func main() {
 	ctx := context.Background()
 
 	fmt.Println("🚀 O-RAN Network Slicing with Claude CLI Integration")
-	fmt.Println("====================================================\n")
+	fmt.Println("====================================================")
+	fmt.Println() // Add blank line explicitly
 
 	// Create Claude client with tmux integration
 	config := &claude.ClientConfig{

pkg/security/validation_test.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"os"
 	"runtime"
+	"strings"
 	"sync"
 	"testing"
 	"time"

pkg/websocket/server.go

@@ -121,6 +121,7 @@ func (s *Server) handleWebSocket(w http.ResponseWriter, r *http.Request) {
 	// Create new session
 	sessionID := uuid.New().String()
 	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel() // Ensure cancel is called on all paths
 
 	// Create Claude client for this session
 	claudeConfig := &claude.ClientConfig{