Add AFFiNE pod creation script with PostgreSQL and Redis

Shell script to create a rootless Podman pod running AFFiNE v0.26.3
with pgvector/PostgreSQL and Redis, managed via systemd user services.
Exposes AFFiNE Web UI and GraphQL API on port 8092.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+This is a personal `~/bin` utilities repository. It is currently empty and ready for scripts and tools.
+
+## Conventions
+
+- Main branch: `main`
+- Scripts should be executable and include appropriate shebangs