chore: add golangci-lint v2 config and fix linter warnings (#46)

- [x] Add golangci-lint v2 configuration with formatters section
- [x] Reorganize linters-settings under linters section
- [x] Replace if-else chains with switch statements for clarity
- [x] Wrap all ignored error returns with `_ = ` pattern
- [x] Add OSC 8 hyperlink helper function for clickable ports
- [x] Add blank line in table styling function
- [x] Remove unnecessary type assertion in test

internal/httplog/logger_test.go

@@ -20,7 +20,7 @@ func TestNewLogger_OutputModes(t *testing.T) {
 	t.Run("empty logFile uses io.Discard", func(t *testing.T) {
 		l, err := NewLogger("test-forward", "", 1024)
 		require.NoError(t, err)
-		defer l.Close()
+		defer func() { _ = l.Close() }()
 
 		assert.Nil(t, l.file)
 		assert.Equal(t, io.Discard, l.output)
@@ -34,7 +34,7 @@ func TestNewLogger_OutputModes(t *testing.T) {
 
 		l, err := NewLogger("test-forward", logFile, 2048)
 		require.NoError(t, err)
-		defer l.Close()
+		defer func() { _ = l.Close() }()
 
 		assert.NotNil(t, l.file)
 		assert.NotEqual(t, io.Discard, l.output)
@@ -58,7 +58,7 @@ func TestNewLogger_OutputModes(t *testing.T) {
 
 		err = l.Log(Entry{Direction: "request"})
 		require.NoError(t, err)
-		l.Close()
+		_ = l.Close()
 
 		// File should have both contents
 		data, _ := os.ReadFile(logFile)

internal/httplog/proxy_test.go

@@ -160,7 +160,7 @@ func TestNewLogger(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, l)
 	assert.Nil(t, l.file) // No file when using stdout
-	l.Close()
+	_ = l.Close()
 
 	// Test file logger (using temp file)
 	tmpFile := t.TempDir() + "/test.log"
@@ -173,7 +173,7 @@ func TestNewLogger(t *testing.T) {
 	err = l.Log(Entry{Direction: "request", Method: "GET"})
 	require.NoError(t, err)
 
-	l.Close()
+	_ = l.Close()
 
 	// Verify file has content
 	data, err := os.ReadFile(tmpFile)