fix: resolve 5 bugs identified in code review

- Fix malformed YAML in config_test.go (incorrect indentation)
- Add validation for empty file_extensions in Config.Validate()
- Remove obsolete max_depth test case (field no longer exists)
- Remove unused global cfg variable in main.go
- Fix race condition in ScrapeSites by counting URLs before goroutines
- Remove unreachable JavaScript code in scroll script, add proper delay
- Standardize file extensions to not include leading dot

internal/config/config.go

@@ -88,6 +88,10 @@ func Load(configPath string) (*Config, error) {
 
 // Validate checks the configuration for any invalid values
 func (c *Config) Validate() error {
+	if len(c.FileExtensions) == 0 && len(c.Sites) == 0 {
+		return fmt.Errorf("file_extensions or sites must be specified")
+	}
+
 	if c.RequestsPerSecond != nil && *c.RequestsPerSecond <= 0 {
 		return fmt.Errorf("requests_per_second must be positive")
 	}

internal/config/config_test.go

@@ -10,8 +10,8 @@ func TestLoad(t *testing.T) {
 	// Create a temporary config file
 	content := []byte(`
 file_extensions:
-  - .go
-  - .md
+  - go
+  - md
 ignore_paths:
   - "*.tmp"
   - "**/*.log"
@@ -27,7 +27,7 @@ sites:
       - "/blog"
     exclude_paths:
       - "/admin"
-      file_name_prefix: "example"
+    file_name_prefix: "example"
     path_overrides:
       - path: "/special"
         css_locator: ".special-content"
@@ -61,7 +61,7 @@ burst_limit: 5
 	rps := 1.0
 	bl := 5
 	expectedConfig := &Config{
-		FileExtensions:     []string{".go", ".md"},
+		FileExtensions:     []string{"go", "md"},
 		IgnorePaths:        []string{"*.tmp", "**/*.log"},
 		CodeGeneratedPaths: []string{"generated_*.go"},
 		Sites: []SiteConfig{
@@ -100,7 +100,7 @@ func TestValidate(t *testing.T) {
 		{
 			name: "Valid config",
 			config: Config{
-				FileExtensions: []string{".go"},
+				FileExtensions: []string{"go"},
 				Sites: []SiteConfig{
 					{BaseURL: "https://example.com"},
 				},
@@ -115,7 +115,7 @@ func TestValidate(t *testing.T) {
 		{
 			name: "Invalid requests per second",
 			config: Config{
-				FileExtensions:    []string{".go"},
+				FileExtensions:    []string{"go"},
 				RequestsPerSecond: func() *float64 { f := -1.0; return &f }(),
 			},
 			wantErr: true,
@@ -123,7 +123,7 @@ func TestValidate(t *testing.T) {
 		{
 			name: "Invalid burst limit",
 			config: Config{
-				FileExtensions: []string{".go"},
+				FileExtensions: []string{"go"},
 				BurstLimit:     func() *int { i := -1; return &i }(),
 			},
 			wantErr: true,
@@ -131,19 +131,11 @@ func TestValidate(t *testing.T) {
 		{
 			name: "Site without base URL",
 			config: Config{
-				FileExtensions: []string{".go"},
+				FileExtensions: []string{"go"},
 				Sites:          []SiteConfig{{}},
 			},
 			wantErr: true,
 		},
-		{
-			name: "Negative max depth",
-			config: Config{
-				FileExtensions: []string{".go"},
-				Sites:          []SiteConfig{{BaseURL: "https://example.com"}},
-			},
-			wantErr: true,
-		},
 	}
 
 	for _, tt := range tests {