Add teabot daemon implementation

teabot watches Gitea repos and dispatches one-shot Claude Code sessions in
Docker containers to work issues and review PRs, acting as configurable bot
personalities.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

main.go

@@ -0,0 +1,13 @@
+// Command teabot is a daemon that watches Gitea repositories and dispatches
+// one-shot Claude Code sessions in Docker containers to work issues and review
+// pull requests.
+package main
+
+import "git.unkin.net/unkin/teabot/internal/cli"
+
+// version is overridden at build time via -ldflags "-X main.version=...".
+var version = "dev"
+
+func main() {
+	cli.Execute(version)
+}