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>

.gitea/workflows/ci.yml

@@ -269,14 +269,23 @@ jobs:
     needs: [go-protocols, ts-auth, ts-storage, webmail-build]
     steps:
       - uses: actions/checkout@v7
-      - run: cp .env.example .env
+      - run: scripts/init-env.sh
       # The proxy network is declared external because Coolify owns it on the
       # deploy host. Nothing creates it here, and without it compose refuses to
       # start the stack at all.
+      #
+      # Idempotent on purpose: the runner's Docker daemon outlives the job, so
+      # the network may already exist from an earlier run.
       - name: Cria a rede do proxy
-        run: docker network create "${COOLIFY_PROXY_NETWORK:-coolify}"
+        run: |
+          net="${COOLIFY_PROXY_NETWORK:-coolify}"
+          docker network inspect "$net" >/dev/null 2>&1 || docker network create "$net"
       # The build overlay is explicit here: CI has to exercise the code in the
       # branch, not the images already published from main.
       - run: docker compose -f docker-compose.yaml -f docker-compose.build.yaml --env-file .env up --build --wait
       - run: docker compose -f docker-compose.yaml -f docker-compose.build.yaml ps
-      - run: docker compose -f docker-compose.yaml -f docker-compose.build.yaml down -v
+      # Always, or a failed `up` leaves containers and volumes behind in the
+      # daemon the next run starts from.
+      - name: Derruba a stack
+        if: always()
+        run: docker compose -f docker-compose.yaml -f docker-compose.build.yaml down -v