Initial commit: email-openclaw bridge v1

Full pipeline: IMAP ingress -> OpenClaw dispatch -> callback -> SMTP reply.
SQLite stateful storage with idempotency, threading, and retry logic.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/logging/logger.go

@@ -0,0 +1,25 @@
+package logging
+
+import (
+	"log/slog"
+	"os"
+)
+
+// Setup initialises the application-wide structured logger.
+// All output goes to stdout as JSON for easy parsing by Docker / log aggregators.
+func Setup() {
+	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+		Level: slog.LevelInfo,
+	})
+	slog.SetDefault(slog.New(handler))
+}
+
+// TaskLogger returns a logger pre-populated with common task fields.
+// Usage: logging.TaskLogger(taskUUID, threadID, messageID).Info("message", ...)
+func TaskLogger(taskUUID, threadID, messageID string) *slog.Logger {
+	return slog.With(
+		"task_uuid", taskUUID,
+		"thread_id", threadID,
+		"message_id", messageID,
+	)
+}