feat(config): add timeout configuration for metadata extraction

internal/config/config.go

@@ -84,11 +84,12 @@ type AIEmbeddingConfig struct {
 }
 
 type AIMetadataConfig struct {
-	Model            string   `yaml:"model"`
-	FallbackModels   []string `yaml:"fallback_models"`
-	FallbackModel    string   `yaml:"fallback_model"` // legacy single fallback
-	Temperature      float64  `yaml:"temperature"`
-	LogConversations bool     `yaml:"log_conversations"`
+	Model            string        `yaml:"model"`
+	FallbackModels   []string      `yaml:"fallback_models"`
+	FallbackModel    string        `yaml:"fallback_model"` // legacy single fallback
+	Temperature      float64       `yaml:"temperature"`
+	LogConversations bool          `yaml:"log_conversations"`
+	Timeout          time.Duration `yaml:"timeout"`
 }
 
 type LiteLLMConfig struct {

internal/config/loader.go

@@ -73,6 +73,7 @@ func defaultConfig() Config {
 			Metadata: AIMetadataConfig{
 				Model:       "gpt-4o-mini",
 				Temperature: 0.1,
+				Timeout:     10 * time.Second,
 			},
 			Ollama: OllamaConfig{
 				BaseURL: "http://localhost:11434/v1",