feat: add code-server service and repo scaffolding

Set up the per-service layout: each service directory holds compose.yml
with a committed .env.example and a gitignored .env.

Add code-server as the first service, plus a README and CLAUDE.md
documenting that these files target Coolify/Dokploy and deliberately
omit ports and restart policies.

code-server/.env.example

@@ -0,0 +1,16 @@
+# Copy to .env and fill in. Never commit .env.
+#
+#   cp .env.example .env
+
+# Web UI login password. MUST NOT be blank -- the LinuxServer image serves
+# code-server without authentication when PASSWORD is empty.
+# Also used for SUDO_PASSWORD inside the container.
+# Generate one with: openssl rand -base64 24
+PASSWORD=
+
+# Git identity baked into the container (author + committer).
+GIT_NAME=
+GIT_EMAIL=
+
+# OpenAI Codex CLI auth token. Leave blank if you don't use Codex.
+CODEX_ACCESS_TOKEN=