release: 1.0.0, a changelog, one .env.example and the docs to match

- CHANGELOG.md and CHANGELOG.pt-BR.md, from the project history.
- .env.example now serves development and production; scripts/init-env.sh
  (make env) creates .env with random secrets. .env.production.example is gone.
- docs/RELEASING.md: the pipeline, how a version is cut and deployed, the runners.
- DEPLOYMENT.md and both READMEs updated for Gitea and the new env flow.
- Service versions set to 1.0.0.
- CI: the proxy network step is idempotent and the stack is torn down always,
  since the runner's Docker daemon now outlives a job.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/RELEASING.md

@@ -0,0 +1,88 @@
+# Releasing LambdaMail
+
+How a version gets from a commit to a server, and what runs where. The history
+of what changed is in the [CHANGELOG](../CHANGELOG.md).
+
+## The pipeline
+
+Everything runs on **Gitea Actions** (`.gitea/workflows/`), on runners hosted on
+the Oracle server.
+
+| Workflow | Runs on | Does |
+| :--- | :--- | :--- |
+| `ci.yml` | every push and pull request | language lint, Go and TypeScript suites against a real Postgres, webmail tests, a Trivy scan of the repository and of each image, and the whole stack brought up with compose |
+| `release.yml` | a push to `main`, a `v*` tag, or by hand | runs `ci.yml` again, builds the six images for `linux/amd64` and `linux/arm64`, publishes them, and on a tag creates the release |
+
+Nothing is published unless the full suite passes first.
+
+Images go to the Gitea registry, one package per service:
+
+```
+git.lucasrguerra.dev.br/lucasrguerra/lambdamail/{protocols,auth,storage,webmail,migrations,rspamd}
+```
+
+Tags on every image: `latest`, `sha-<full commit>`, and on a version tag also
+`1.2.3`, `1.2` and `1`. The packages are public, so a server pulls them without
+logging in.
+
+## Cutting a release
+
+1. Update [CHANGELOG.md](../CHANGELOG.md) and [CHANGELOG.pt-BR.md](../CHANGELOG.pt-BR.md):
+   move what is under *Unreleased* to a new `## [X.Y.Z] - date` section.
+2. Set `"version"` in `services/{auth,storage,webmail}/package.json` and their
+   lockfiles to the same number.
+3. Merge to `main` and wait for the `Release` run of that merge to go green.
+4. Tag the merge commit and push the tag:
+
+   ```bash
+   git tag -a v1.2.3 -m "LambdaMail 1.2.3"
+   git push gitea v1.2.3
+   ```
+
+The tag triggers `release.yml` once more. It republishes the images under
+`1.2.3`, `1.2` and `1` (layers are cached, so this is quick) and creates the
+entry under **Releases** with the image list and the commit log since the
+previous tag. A tag with a hyphen (`v1.3.0-rc.1`) is marked as a pre-release.
+
+Versions follow [Semantic Versioning](https://semver.org/): a change to a
+migration, a required environment variable, or a published port is at least a
+minor release, and anything that needs manual steps on upgrade is called out in
+the changelog.
+
+## Deploying a version
+
+Coolify pulls; it does not build. See the *Upgrading* section of
+[DEPLOYMENT.md](DEPLOYMENT.md) for the two-step deploy (set `IMAGE_TAG`, then
+deploy). In short:
+
+1. `IMAGE_TAG` = the release (`1.2.3`) or `sha-<commit>`. Never `latest`.
+2. Deploy. Migrations run before the services that need them.
+3. Check `GET /health` on `protocols` and sign in to the webmail.
+
+To roll back, set `IMAGE_TAG` back to the previous release and deploy again.
+Migrations are not reverted: write them so the previous version still runs
+against the new schema.
+
+## Runners
+
+Two `act_runner` instances run on the Oracle server (Ampere ARM, 4 cores), each
+with its own Docker-in-Docker daemon, so two jobs never share a network or a
+port. The jobs run unprivileged.
+
+- `linux/arm64` images build natively; `linux/amd64` images build under QEMU
+  emulation, which is slower. Layers are cached in the registry.
+- The Docker daemon of each runner keeps its layer cache between runs, and the
+  toolcache volume keeps downloaded toolchains.
+- The workspace of a job is not visible to the Docker daemon, so workflows copy
+  files into containers with `docker cp` instead of mounting them with `-v`.
+- Windows and macOS jobs cannot run here.
+
+## Why some actions are not used
+
+- `aquasecurity/trivy-action` clones Trivy from the workflow's own server,
+  which is Gitea; Trivy runs from its official image instead.
+- `actions/upload-artifact` v4+ and the `gha` build cache are GitHub services;
+  per-architecture images are told apart by tag, and the cache lives in the
+  registry.
+- Workflows read `GITHUB_OUTPUT` and `GITHUB_STEP_SUMMARY` under those names:
+  the `GITEA_*` equivalents are not set by the runner.