[ADD] ci: Forgejo Actions CI and Claude bots ported from ecocentral

Same system as ecocentral-18 (see its docs/CI-CD.md):

- ci.yml: lint (pre-commit), test (tools/ci/run_tests.py, OCA-style
  two-phase install) and review (PR bot, after lint and test).
- issue-bot.yml: the issue bot answers issues or opens a PR on bot/issue-N.
- pr-bot.yml: review when WIP is removed or the i18n label is added.
- .gitea/issue-bot.md: context for the bots; this repo is shared by
  several clients.

The bot scripts are copies of ecocentral's. Only the defaults differ (repo,
token and state files, i18n languages es,eu,ca,gl) along with the [I18N]
commit message and the references to the runner's sources.txt.

The jobs run on a second forgejo-runner registration (CriptoMart org) on
ecocentral's runner machine, sharing its image, mounts and cache. The
runner files (Dockerfile, update.sh, sources.txt) live in ecocentral.
Specific to this repo:

- ODOO_SRC_SKIP: the runner's /odoo-src/18.0 holds a clone of addons-cm,
  so test skips it and checks the PR checkout instead.
- BOT_BASE_BRANCH "18.0": the repo's default branch is 16.0.
- test PostgreSQL on port 54330: ecocentral's runs on 54329 and a test job
  from each repo can run at the same time.

The lint job fails until the repo is cleaned up with
pre-commit run --all-files.

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

.gitea/workflows/pr-bot.yml

@@ -0,0 +1,36 @@
+name: Bot de revisión
+run-name: "#${{ github.event.pull_request.number }} ${{ github.event.pull_request.title }}"
+# La revisión normal es el job review de ci.yml, que corre detrás de lint y
+# test. Este workflow cubre los dos cambios que no relanzan el CI: quitar la
+# marca WIP (es editar el título) y poner la etiqueta i18n. review.py comprueba
+# que el CI ya había pasado para ese commit y que no está revisado.
+on:
+    pull_request:
+        types: [edited, labeled]
+        branches: ["18.0"]
+
+jobs:
+    bot:
+        runs-on: issue-bot
+        if: "!github.event.pull_request.draft"
+        steps:
+            - uses: actions/checkout@v4
+              with:
+                  fetch-depth: 0
+                  # review.py pone las credenciales de la cuenta del bot al hacer push.
+                  persist-credentials: false
+            - name: Run bot
+              env:
+                  BOT_FORGEJO_URL: ${{ github.server_url }}
+                  BOT_FORGEJO_REPO: ${{ github.repository }}
+                  # La rama por defecto del repo es 16.0: sin esto el bot tomaría
+                  # esa como base.
+                  BOT_BASE_BRANCH: "18.0"
+                  BOT_FORGEJO_TOKEN: ${{ secrets.BOT_FORGEJO_TOKEN }}
+                  # Basta con uno de los dos.
+                  CLAUDE_CODE_OAUTH_TOKEN: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+                  ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+                  BOT_REPO_DIR: ${{ github.workspace }}
+                  BOT_ODOO_SRC: /odoo-src/18.0:/odoo-src/18.0-oca
+                  BOT_POT_DIR: /root/.cache/eco-pr-bot/pot
+              run: python3 tools/pr_bot/review.py run "${{ github.event.pull_request.number }}"