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>

.gitignore

@@ -0,0 +1,16 @@
+# Environment
+.env
+
+# Database
+data/*.db
+data/*.db-wal
+data/*.db-shm
+
+# Go
+/bin/
+/tmp/
+
+# IDE
+.idea/
+.vscode/
+*.swp