feat(v2): T-309 SQLite fall-event persistence (mattn/go-sqlite3)

Persist confirmed fall events to a local SQLite DB under artifacts/:
camera host/port/channel + event id/track/source/config version/state/
latency/screenshot path/confirmed-at. Schema stores no password (guarded
by test). Wire openRecorder/saveRecord into the alerts loop; failures are
non-fatal. Re-applied the SILVER-POSE vendored os_windows.go patch that
go mod vendor reverted.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

v2/cmd/silver-pose/main.go

@@ -20,6 +20,7 @@ import (
 	"silverpose/v2/internal/monitor"
 	"silverpose/v2/internal/source"
 	"silverpose/v2/internal/spike"
+	"silverpose/v2/internal/store"
 	"silverpose/v2/internal/ui"
 )
 
@@ -129,6 +130,10 @@ func (controller *controller) run(ctx context.Context, cancel func(), runID uint
 		controller.window.ReportIssue("无法启动监控管线")
 		return
 	}
+	recorder := openRecorder(cfg)
+	if recorder != nil {
+		defer recorder.Close()
+	}
 	go monitored.Run(ctx)
 	updates, alerts := monitored.Updates(), monitored.Alerts()
 	for updates != nil || alerts != nil {
@@ -145,10 +150,41 @@ func (controller *controller) run(ctx context.Context, cancel func(), runID uint
 				continue
 			}
 			controller.window.PresentAlert(record)
+			saveRecord(recorder, cfg, record)
 		}
 	}
 }
 
+// openRecorder opens the local SQLite fall database under the event directory.
+// A failure is logged and monitoring continues without persistence.
+func openRecorder(cfg config.Config) *store.Store {
+	if err := os.MkdirAll(cfg.Artifacts.EventDirectory, 0o755); err != nil {
+		log.Printf("创建事件目录失败：%v", err)
+		return nil
+	}
+	recorder, err := store.Open(filepath.Join(cfg.Artifacts.EventDirectory, "fall-events.db"))
+	if err != nil {
+		log.Printf("打开摔倒数据库失败：%v", err)
+		return nil
+	}
+	return recorder
+}
+
+func saveRecord(recorder *store.Store, cfg config.Config, record alert.Record) {
+	if recorder == nil {
+		return
+	}
+	if err := recorder.Save(store.Record{
+		EventID: record.Event.EventID, TrackID: record.Event.TrackID, SourceID: cfg.Source.ID,
+		CameraHost: cfg.Source.Host, CameraPort: cfg.Source.Port, CameraChannel: cfg.Source.Channel,
+		ConfigVersion: record.Event.ConfigVersion, State: fmt.Sprint(record.Event.State),
+		LatencySeconds: record.Event.LatencySeconds, ScreenshotPath: record.ScreenshotPath,
+		ConfirmedAtUTC: record.CreatedAtUTC.UTC().Format(time.RFC3339),
+	}); err != nil {
+		log.Printf("写入摔倒记录失败：%v", err)
+	}
+}
+
 func validateStartup(cfg config.Config) error {
 	for _, path := range []string{cfg.Model.ONNXPath, cfg.Model.ONNXRuntimeDLLPath, cfg.Tools.FFmpegPath, cfg.Tools.FFprobePath} {
 		info, err := os.Stat(path)