v1.0.8: Add configurable log level and immediate service stop

- Add log_level config option (debug, info, warn, error)
- Add JA4SENTINEL_LOG_LEVEL environment variable support
- Set TimeoutStopSec=2 for immediate stop on restart/stop
- Consolidate config files into single example (config.yml.example)
- Update RPM changelog

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

api/types.go

@@ -23,6 +23,7 @@ type Config struct {
 	BPFFilter        string   `json:"bpf_filter,omitempty"`
 	FlowTimeoutSec   int      `json:"flow_timeout_sec,omitempty"` // Timeout for TLS handshake extraction (default: 30)
 	PacketBufferSize int      `json:"packet_buffer_size,omitempty"` // Buffer size for packet channel (default: 1000)
+	LogLevel         string   `json:"log_level,omitempty"` // Log level: debug, info, warn, error (default: info)
 }
 
 // IPMeta contains IP metadata for stack fingerprinting
@@ -241,6 +242,7 @@ const (
 	DefaultBPFFilter    = ""
 	DefaultFlowTimeout  = 30 // seconds
 	DefaultPacketBuffer = 1000 // packet channel buffer size
+	DefaultLogLevel     = "info"
 )
 
 // DefaultConfig returns an AppConfig with sensible default values.
@@ -256,6 +258,7 @@ func DefaultConfig() AppConfig {
 			BPFFilter:        DefaultBPFFilter,
 			FlowTimeoutSec:   DefaultFlowTimeout,
 			PacketBufferSize: DefaultPacketBuffer,
+			LogLevel:         DefaultLogLevel,
 		},
 		Outputs: []OutputConfig{},
 	}