chore: add Claude Code project context

CLAUDE.md

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+# Docker Compose Stacks Repository
+
+This repository is for regular, non-Swarm Docker Compose stacks for Wheelz's HomeLab.
+
+## Repository Purpose
+
+- Store standalone Docker Compose stacks that run with `docker compose`.
+- Do not add Docker Swarm stack files here.
+- Use this repo for services that are deployed on a single Docker host or non-Swarm compose environment.
+
+## Rules
+
+- Never commit real secrets, passwords, tokens, API keys, private keys, or recovery codes.
+- Use `.env.example` files for required variables.
+- Prefer clear service-specific filenames such as `<service>-compose.yml` and `<service>.env.example`.
+- Keep persistent data paths explicit and documented.
+- Prefer named volumes or clearly documented bind mounts. If bind mounts are used, make host paths configurable through `.env` variables.
+- Add comments for non-obvious ports, volumes, healthchecks, hardware acceleration, and reverse-proxy expectations.
+- Preserve existing files unless the user explicitly asks to replace or reorganize them.
+- Do not push to Gitea unless the user explicitly asks.
+
+## Validation
+
+For regular Compose files, validate with:
+
+```bash
+docker compose --env-file <service>.env.example -f <service>-compose.yml config
+```
+
+If the example env intentionally contains placeholder values that prevent validation, explain what placeholders must be filled in.
+
+## Current Files
+
+- `immich-compose.yml` — regular Docker Compose stack for Immich.
+- `immich.env.example` — example environment variables for Immich.