chore(*): adopt project templates

caddy/README.md

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+# caddy
+
+`site.caddy` routes `{$BEAVERGRAM_DOMAIN}` to the project's services over the external `caddy` docker network. It works standalone and inside a shared Caddy that fronts several projects.
+
+Standalone:
+
+```sh
+docker network create caddy
+cp Caddyfile.example Caddyfile
+cp .env.example .env
+docker compose up -d
+```
+
+Shared Caddy: mount this directory as `/etc/caddy/projects.d/beavergram:ro`, keep `import /etc/caddy/projects.d/*/site.caddy` in its Caddyfile and put `BEAVERGRAM_DOMAIN` in its environment.
+
+Rules that keep `site.caddy` portable:
+
+- the domain comes only from the environment variable
+- no `tls` block, certificates are configured by the host Caddy (`acme_dns cloudflare {env.CLOUDFLARE_API_TOKEN}` in the global block)
+- snippets are prefixed with the project slug because Caddy snippets are global
+- mount the directory, not the file: a single-file bind mount goes stale when git replaces the inode
+- keep `admin localhost:2019`, `admin off` makes `caddy reload` impossible